I had a therapist tell me that it's quite easy to get yourself into being Agoraphobic if not careful. She has a friend who went through some things and now, a few years later, completely isolates and won't even leave to go to the store and nearly died b/c she did not want to go to the hospital when ill. I don't know if that is happening to him, but it sounds like it could turn to that.
He sounds depressed, however he also does not seem ready to accept any responsibility or tell any truths about what is happening in his head. My XAH takes enough Xanax to put down an elephant, I can only say it makes him tired and withdrawn. When he drinks it makes him blackout drunk and mean.
It sounds like he needs a new therapist and psychologist who he is ready to be honest with, and the reality is that may never happen.
Sending you huge hugs. I would not leave a child in his care, ever. All of this is just my .02
(FYI...Adderall is just legal coke, and Xanax is a benzo. So uppers and downers)