Try to get away by yourself and relax a few mins. I don't know what you son's diagnosis might be- but it could be wrong and he could be on the wrong medication. I suggest letting psychiatrist know all about this first thing tomorrow- or even call him tonight if he'll take an emergency call. Secondly, if they are telling you to use the traditional behavioral modification/contract methods, it might not work- it just doesn't work with some kids and in our case, it made my son worse. We tried it for 2 mos or so and it was a disaster.
If you haven't done this already, make sure you make a list of any signs you see in your son that seem out of character or any changes in habits whatsoever (eating, sleeping, upsets at school, etc). I only bring that up because when things first went awry with my son, I was so busy trying to concentrate on what I thought were the most critical things going on, that I compeltely overlooked telling the profs things that were minor in comparisom, but "out of character" or changes none-the-less. This could make a difference in diagnosis and/or medications.
Hang in there- I'm sorry you've had a roung eveniung but you did the right thing.