Wow,that's a long wait. I hopes things turn out ok for you at the hearing. Do you have a lawyer?

Fwiw, I had to see an psych professional contracted with ssdi for an evaluation. I was super nervous about it, mostly because the doctor's name was a guy (I'm very intimidated when having to talk to a male psych). It turned out pretty easy to get through. I ended up seeing one of his post docs for the interview. While it was triggering and anxiety-provoking to rehash all the things she asked about, she was nice about it. The whole time I was panicked to say the wrong thing and wind up either hospitalized or denied ssdi because of the interview. Neither happened. There's a form they go through to standardize the assessment. It took me about an hour. I'm pretty sure I felt like she was going to think I was faking everything, but because they are just contracted to do assessments occasionally, I think they don't really have much invested in trying to be adversarial. They simply conform the info on your application.

Good luck with everything. Sorry I don't have any advice on how to prepare...