What DLA said. There are problems going on and one that's making you hurt is your kid beating you up. Talk to his therp about behavior mod, perhaps.
You have to really take control of him and not let him control you. He needs a very structured life and lots of activities to get rid of the pent-up energy.
You have to be very careful with bipolar children and make sure they have really solid rules and regualtions to live by, b/c they will try to break all of them and a lot of others. Thank the Lord above I had a very strict and structured family environment that kept me from going over board with my behavior.
There is another mother on here who is going through this same thing right now. Can't remember her name, but if you'll read thru the posts you will find her.
Good luck.