I'm happy to help

Every time I answer tests like that, I always answer only for Schizoid Personality Disorder. I've experienced other symptoms but not consistently.
For what it's worth, I've been in psychiatry on and off since elementary school and never got a really set diagnosis except anxiety until all of a sudden I was diagnosed with about 7 things or something. Most of those weren't right (hardly any, to be fair) and then (most of) those were taken away and they found out I have DID, OCD, Anorexia Nervosa and Recurrent Depression (also have PTSD and Selective Mutism but my T took those diagnoses away because they are better covered by the DID). Anyway - what I'm trying to say is that sometimes it can take a while (or a long time even) to figure out exactly what it is, especially if your signs aren't the hallmark signs of what it is you are struggling with. But you are trying and that is great because it means you're willing to look inwards and do the work to heal too

usually I don't even remember that I forget stuff, so generally it doesn't bother me. I'm surprised I've been able to remember this much this time. My mind goes blank a lot when I try to talk/write about stuff (don't ask me about what 'cause I don't know). Or I think I'm exaggerating and forgetting really wasn't abnormal/a problem. Or it didn't really happen.
We experience this a lot too (not just related to the DID, but in general). I think this is often a trauma response and not just a "dissociative disorder" response. I would definitely tell a T this though, as it is very good information to work from. Not remembering that you forget stuff is something we very much relate to.
but I really can't imagine talking to a therapist about it...
You could consider writing a letter to the T explaining things, or print out this page from the forum (or just the text so she can't see your username etc if that bothers you), or send her the link here or something like that? There's lots of ways to communicate, maybe look into finding a way that makes you more comfortable or able to share?