Unfortunately I am all too familiar with the getting kicked out of the hospital situation. Oldest used to be HORRIBLE to the nurses. When she was in pediatrics, they tolerated it, I think becuase they had to, although occasionally they'd call security to deal with her. I hated hearing that "Code Hercules" over the hospitals PA system. Once she was an adult and had the legal ability to sign out AMA ("against medical advice"), she signed herself out or was "kicked out" a few times. I got calls from nurses or social workers asking me to pick her up.. it was so embarrasssing. I eventually started refusing to go get her, and told them to either give her a cab voucher or call DSS or mental health to deal with her. Ugh, I haven't thought about those days in a long time. It was incredibly stressful.
I'm sorry. Just wanted you to know that I "get it." Hope you find a good meeting that helps you through this.
Edit: just thought of something else . We eventually figured out that certain medications made Oldest's behavior worse: namely high doses of Demarol, as well as Versed (given before surgery). Both made her a total, irrational B. The more she got, the nastier she became. It's possible something similar contributed to your difficult child's behavior .. although of course it doesn't help much at this point.