Yes, well, do normal people have people in their head mad at other people in their head for changing what they wrote? And do said mad people in their heads yell at them to go back and fix it until they do?
Does your T even know the SCID-D? It’s a pretty niche thing to know, it seems, so if your T doesn’t specialise in dissociative disorders, he may not even know the SCID-D. This is the advantage to the MID because it does not require training. The DES is recommended as a screener, including by the creators of EMDR (because EMDR apparently brings out dissociative tendencies), but I don’t like the DES, and neither do at least some people who practice EMDR. It does not do a very good job of diagnosing dissociation, which is why it is recommended as a screener. I think the MID does a better job. The MID also tells you what kind of dissociative symptoms you experience, so it could help clarify what kind of dissociative experiences you experience.
On the other hand, I understand your caution. If the right part of me is not answering the questions on the DES or the MID, they will say we don’t experience dissociation at all. And afterwards, when I remember that I do experience other symptoms, I wonder why I wrote what I wrote. This gets especially worse when I know someone else will be looking at it. Also, when we took the MID, they kept arguing because some of them experienced it and some didn't. Some of it experienced it most of the time they were out, but how much of the body's experience does that account for? And after a while (there were 217 questions), some part just started putting down their answers and not asking everyone else because they got annoyed with how long it was taking. This is another reason why the SCID-D, which often triggers a switch, is preferred. So I get why it makes sense just to say, yes, I have it, and be done with it.
Just because you weren't able to answer yes to any of the questions I asked about memory does not mean that you don't lose time, I think. Personally, I remember buying stuff, but I don't remember why I bought it - sort of like, yes, I was there, but only along for the ride.
I didn't realise how often I switched either until I try to post here or read journal entries from the past year or hang out with other people. For me, it all still feels like me, but the reaction/emotion(al capacity)/cognitive capacity/knowledge/memory/behavior is so wildly different from other times that... I'm now pretty sure it's a switch.
But I can't figure out how I could think for so many years that I am the same type of person all the time. For example, we had a host change (no one knows exactly when). We conceptualised ourself as the old host, even after the old host temporarily disappeared. So everybody would be like, you don't act like that. And we didn't. Sometimes we would think that we'd changed somehow from the this person we were for so many years and be unsure how (the host changed), and sometimes we would think that we had always been like we were now (as an alter, we had not changed). We didn't realise what had happened until the old host came back, and we learned DID terminology.