I'm thinking of printing out some of those studies showing the differences in brain changes between "regular" PTSD and the dissociative PTSD subtype(s) for the PT.
so if a PT has little knowledge in advance of this stuff but can read a scientific study with fMRI evidence, I think it likely that scientifically educated folks would more fully accept it than it being "my experience"
But still, you will need to relate this to your experience to make it valid for you. The evidence, imho, honestly isn't as powerful as your direct experience of symptoms and being able to articulate how they slow you down. Also, I tend to be extremely careful about looking like I'm schooling anyone because it would be easy for me to do. But I'm also coming from the perspective of not needing external voices and materials to justify or explain my experience or symptoms, because they speak strongly enough. And when they don't (like I'm not having a panic attack in the doctor's office), my explanation of how they affect me in my daily life is what gets her support and guidance.
So that's where I'm coming from. YOUR experience is more important...finding a way to articulate it in a simple but clear way. And then maybe have some well-chosen and not overly heavy information available if the PT is interested. Do you think you have the kind of PT who would be open to reading articles you bring? Or would you explain your experience and just offer the articles as more information if they are interested in reading more...leaving it up to them. ??
I'm also coming from years of PT on and off myself, but I think since I have a body psychotherapist (SE, etc), this stuff didn't factor into my PT too much. But I think more because I knew when I hit a plateau and deserved a break. If you are making steady, though slow, progress, why would they yank it away from you? Have you asked your PT if it looks like you can continue or if they see strong goals for you into the future? Are you going into all of this based on fears without sort of feeling out where things are at and if they are still on your side? You mentioned something about reading expressions and making catastrophic conclusions (I do the same thing). So do you feel the PT indicated this work isn't going anywhere, or did you feel they were frustrated or losing interest/hope, etc?
Also, I hear you've felt burned and invalidated. I know not everyone understands. I tend to just stick with those who do. But have you brought articles to professionals before and found that to be helpful? Now we do know a lot more about the dissociative experience. You absolutely can talk about your very own experience, and maybe have some resources that back you up if you get the feeling it is completely foreign territory to your PT. Just be careful not to come across like you are trying to justify yourself, if you know what I mean, but that you trust your reality (even if you don't sometimes) and your articles are simply there for the PT if they'd like to know more. It's all about self advocacy and at times you do have to trust your reality first, or others will feel suspicious. Trust what you do know and work to articulate it (writing it out first helps me a lot because I stumble and get nervous speaking)...and then support that in a way that comes across as helpful but not schoolish. Like, "Here is an article that explains PTSD with dissociation" if you are interested in more information..." ???
(sorry I often have more questions than answers)