As per oaktree's suggestion (in dissociative-identity/topic103617.html ; trigger warning), and to stop hijacking and polluting other threads inappropriately, here I created my own thread to reason about what is going on with me. After having done the "I'm a liar and probably suffer from factitious disorder" ... "scenario" (I was "sizzling hot" from a conflict with my parents, and lacked a retrospective view of my situation), I'm back in partial denial and/or questioning. I will simply post my reflections in a revised and condensed form (well, I may break from that restricted approach if needed) here, as they come and go.
Feel free to comment and post food for thought; I rarely seek external help, but with my current environment and my current situation, I feel the need for help and insight from other persons going or having gone through a similar phase.
Oh, and I know, this post is ridiculously long (so much for the condensed approach

Oh, and before I forget about it, this thread may contain triggering material.
"Heeeeere we goooooo !!!!" [Super Mario 64 style]
--- Causes for doubting again ---
First of all, one should mention the event and the general context that brings me back to being in a questioning phase again. The general context being simply that I notice several dissociative symptoms and other related manifestations again (which oddly disappeared for a while, just as I was finally accepting DID after having been hospitalized): poor working memory, forgetting skills at which I am proficient, forgetting that I have done something when I thought I did not, or it's opposite, being certain I did something, and later realizing I hadn't, getting absorbed by reading material, music, movies up to the point of unresponsiveness unless being touched (and even then), feeling like a puppeteer of my own body (that actually hasn't changed since ... a long time, actually, at least several years, can't tell more precisely), forgetting where I am headed in car, forgetting where I am and orientation sense in a known place, being unable to concentrate, feeling "fuzzy" all of a sudden, forgetting known information, losing track of a conversation and it's entire subject mid-sentence, looking for stuff where it used to be a long time ago, placing stuff where it used to be a long time ago when I know where it goes nowadays, watching a movie that I like and not remembering it at all, the list could go on for quite some (extra) time ...
Now, I spent the last two days at a friend's place. My friend, obviously afflicted by a few mental issues of her own, constantly lived in an environment of parental negligence. She moved away in the summer for her studies, and it was hard for her to come back to her dad's place for the holidays. The event that particularly brought suspicion over what is going on with me is strange, even for me. I apparently entered a trance on the first evening there, where I would not answer to my name, but would answer if called "Slave" (in english, whereas I live in a french-speaking part of Canada), and would do anything that I was asked. At some point she decided to get me for a walk outside because her brothers were trying to get me to undress completely naked. I don't remember a good part of the evening, including the walk where I was "apparently normal", which is odd. Then on the next morning, it happened just after we woke up. She got some Majora's Mask soundtrack on, and I just completely disconnected again. "I" would answer to my name though this time. She realized that her brothers were playing that particular Zelda game the evening before, so after I snapped out of it, we did an experience: that song gets me very quickly into a state of hypnosis (she's familiar with it, her school therapist uses it with her to calm her panic attacks) where I will do anything that is asked of "me". Moreover, during the night, I apparently woke up and started "guarding" her and I was looking for a sharp knife. Of course, I don't remember it at all, and I woke up perfectly refreshed. I am still wondering whether she dreamed that part about me "guarding her" or not, as she sees me kind of like a protective brother.
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The reflection about psychological flexibility or "How good an actor am I, hm, dad ?"
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I have a certain easiness towards acting. I find it easy to emulate (note the term) cohesive and convincing theatre characters. My dad tells me I'm faking a lot of stuff (like my freezing jaw that makes it to talk outside when it's cold, or me not remembering some obvious piece of information), and that my ability for good acting makes it seem real for a lot of people. I decided to engage that ability with another viewpoint. If I have a disorder on the dissociative continuum, it makes a lot of sense for me to be able to emulate other characters or features easily, since my personality would lack the level of integration and cohesion from "normal" people, which, in turn, would make it easy to be that flexible when needed or wanted (or even when not so much). On the other hand, all the social workers, psychologist, psychiatrist and other mental health workers I've met talk about my psychorigidity when not under a situation where one needs to be flexible, which makes my situation quite paradoxal. Able to emulate other people, characters or personality traits in a remarkably unnoticeable way (with a great deal of mental effort, might I add), yet rather psychorigid down the core. Also note how I say "emulate" instead of "becoming"; it relates how unnatural this is to me, while being at the same time convincing, easy yet remarkably mentally taxing.
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The case of the possible host change, or the one topic I consider to have the highest priority in terms of help needed.
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I have read a bit about host changes, both on this forum and elsewhere. It "almost" fits how I feel about the general situation I'm in. Many memories from before August this year feel estranged (as in, not mine) to me, but I remember them. Some "transformation" probably has occured from the "me" before August, but I do not feel like there was a discontinuity while some persons knowing me noticed not massive but still significant changes to my overall personality, and the way I relate to others and act in general. My parents are oblivious to that drastic change because I maintain an "illusion" of continuity (well, assuming there really was a host change, so the illusion could also apply to me/"me"/whatever I'm so lost now). So, in addition to the perspective of possible serious mental disorder, there is the one that "I" from this summer and before is not the same as I, right now, with both "I" and I not being sure and/or aware of it. That is ridiculously mindscrewing.
Ironically, that topic requiring higher priority help is dependent on me accepting a diagnosis of DID or DDNOS. On the other hand, it might prove to be the key in understanding and accepting what is going on with me.
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The possibilities I see
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This is the part where I simply have problems thinking rationally (for reasons explained lower, in the "Dilemma" section). I don't see myself as having DID for the purely intuitive reason that I don't believe I went through significant abuse. There is the rational part of me that hates that intuitive stuff, because it can hardly be proved. If I was to honestly ask my mom, she would say she's the best one there ever was, is or will be in the entire multiverse. My dad considers himself to be a good dad because he practices what he calls "tough love". On the other hand, even when thinking rationally about this, it's pretty hard to imagine that I could have undergone significant abuse, since there are no physical, undeniable manifestations of it, only mental ones, which can, are and maybe will be denied. So I look at DDNOS, example 1 ... which does not fit. I read that the main distinction between DID and DDNOS-1 would be that there is no amnesia. But if I don't even realize the switching, and can only realize that I have amnesia from later retellings, well,it can't be that. On the other hand, I am believing I am faking DID, and my other alters. Honestly, I'm lost. I'm completely lost because even my categorizing, pattern-matching of a mind does not see itself as either one of these. Especially the DID criterion that says that one should "regularly switch". As far as I know, I don't regularly "switch" (excluding earlier said event), or else, someone would notice ... right ?
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The dilemma
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Now, what bothers me most is the following dilemma: if I am faking, then I am crazy, and not even being aware of it, because even though I believe I am faking, I don't feel like I am; on the other hand, if I really have a serious dissociative disorder, then, most probably, bad stuff lingers in my unknown past ... and I don't know which one I prefer between being an unaware faker or really having serious issues to dredge up and fix. Especially in my current family environment, where knives are flying rather low since a few weeks, and support is ... limited, to say it politely.
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Addendum about unusual experiences, list form
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- I have the urge to do things I would not normally do (and I am not sure whether I wish to elaborate on that)
- I have had the need to listen to music I honestly normally dislike.
- I have had thoughts of violent behavior, both towards myself and others, while I am far from being even remotely violent.
- I have had dreams where I would be kind of the spectator of someone else's dreams (if that makes sense). That "dream theater" (yes, as in, I see the "other's dream" like a movie at the theater) always, always looks exactly the same and is part of large, very elegant house or manor that I can explore, in a lucid dream kind of way, but it is difficult to do so. It is stable in time, for the most part. It is ... non-Euclidean, though. And it has a/the "Completely Retargettable Room", which is kind of like a Holodeck, or the secret room that can morph to whatever you want in Harry Potter. And I am totally unable to explain the larger "world" the whole manor sits in, for now. I have had some dreams that repeated themselves exactly the same in the past, but those lucid dreams (they are always lucid dreams) always take place in the same environment, but with a different dream at the "theatre". And the same people are always there, for the most part, but they seem only barely aware of me, and me of them; it looks like what an analog TV would look like with a bad or faint signal, only with more transparency, and I scare them because I appear the same, but only intermittently otherwise I'm "invisible", if I have understood well what they say.
With such a long post, I feel the need to stop there, and continue later. It is difficult anyway to maintain the concentration required to write this, as well as remembering everything I wish(ed) to talk about (I forgot some/a lot)
See you later, me, "me", myself, I and "I" !
P.S.: For others, feel free to add thought material to this ... well, I was going to call it a monologue, but that somehow feels inappropriate.