The other part of her is stuck with this fear that if she doesn't have DID, if WE do not have DID and she reads the books, she'll imagine symptoms that are not there.
The only thing that can happen is you might alter the way symptoms which are
already here can look like to the outside world. Unless you do it consciously, you will not create symptoms out of thine air.
For example, some people with borderline personality disorder can think they have DID,
because they have some dissociative symptoms + parts of their identity that lack integration. They are wrong about having DID, but
they aren't wrong about needing help with integration and dissociation!This is something a bit common with disorders that have some dissociative symptoms and integration issues. A good professional is supposed to be able to make the difference and, not matter what the conclusion is, will not accuse you of faking your symptoms. The explanation might be wrong, but unless you're faking it on purpose,
symptoms are always real.
There is also a fear in her that if she reads and knows too much about DID that a therapist will think she is faking or it will make a legitimate diagnosis (if we can ever actually afford therapy) harder to get.
From my experience, if a T thinks you're faking
just because you know stuff, and does not try to understand how you work first, you need to run away from them.
There are a lot of reasons why someone could know things about dissociation. Me, for example, I'm a psych student and I want to work in the area of trauma and dissociation. I
have to know things about it. Other people could have already been in therapy before, could know someone with DID, etc.
I don't hide my knowledge from my T. I told her right from the beginning I had to do a lot of work alone, and I was searching for a T to help me with the parts I couldn't do on my own. She is 100% okay with that. It happens that we spend some time talking about theory, how it fits (or doesn't) with my system, etc. it's really interesting for both of us.
About diagnosis, I'm working with her since 2020, and she has 0 doubt I have DID. She has recently completed a new training for a diagnosis tool, and I'm currently her first "test subject", so she can practice it on a real patient who is stable enough to see for which questions she needs more insight. So I can tell you that nope, with a good T, having knowledge will not affect your access to a diagnosis. Diagnosis tools are made in a way that, if used by a well-trained T, knowledge isn't supposed to affect the results (unless you're really, really motivated to fake and put a lot of efforts into it, but there are other ways to detect people who are faking on purpose - and you, you aren't doing that).
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French person with ADHD
Former partial DID
Functional multiplicty, highly integrated