You definitely have to change what you're currently doing, for the good of your son (even though he will rage at you initially for this) and for your own safety. I know this sounds like a nightmare and that you probably feel guilty about not being able to keep the court out of this, but you are being worn down and he is placing himself in a deeper and deeper hole.
I would strongly suggest that you attempt to secure the services of a sympathetic lawyer or child advocate who can fully explain all the details of this petition to both you and your son. What we in our profession call an intervention, is needed. Please insist on the fact that your son receive continuing, intensive therapy (not just meeting with a doctor for five minutes and getting a medication review) . I would also highly recommend that you find a good therapist for yourself; this is a crisis-laden time and anyone who would be dealing with your dilemma would need all the wise counsel and support they need. Good luck. I'll be hoping good things will slowly begin to happen for you and your boy.