Wow - that sounds really challenging. So sorry you and your son has to go through this. We have a list of “first aid for psychosis” tips here that may be helpful:
Are you close to a good early psychosis treatment center. I would call them and see if they might be able to help too. They tend to offer good therapy programs as well as other medications management, etc.
It sounds like he has a lot of anxiety - have you talked to the doctor about possible anxiety treatments for him?
Also - some people on our forums swear by L-theanine for helping sleep.