Hey Sharon,
Big (((HUGS))) to you, my friend. I'm so sorry.
I agree with LDM on the seriousness of the physical attack. I know, it was just the wheelchair, but still. I won't tolerate any physical violence or aggression from any of my children.
Having said that, maybe he needs more heavy duty consequences for what he's done. What do you have planned for the next 2 days?
When easy child was on OSS he did classwork here with SO from 8:45 AM, break for lunch, he was allowed outside 30 minutes, then back at it until 4 PM. He did that both days. No TV. No games. Classwork.
Probably a little overload for difficult child, but hopefully you see my point.
I know difficult child was doing well for a while and I feel so sorry for you. You have a hard road with him. However, his physical aggression/violence does not seem to be easing.
A more restricted environment may be a good idea too.
I'm sorry to hear the medications aren't doing what you want them to.
Hugs, friend.
Janna