Maybe just look up the process for reporting professional misconduct. He absolutely was wrong in what he did! You could also call the office where you would report and ask questions, without giving your name, I believe.

The part about "because of my disabilities, no one would believe me", I would like to suggest that perhaps that is one reason he chose you to abuse. Abusers often chose people that they see as weak or unlikely to say something. Just because they see that does not mean it is true. Also, because of your disabilities, it is likely that there are actually other protections for you that someone without disabilities would not have.

Please, consider looking into it. Gathering info doesn't mean you are actually going to report him, but it may help with some of your fears around it.

Puck