I'm so sorry about all the drama. Hopefully they'll get some idea of what you're dealing with while he's there -- and you would be wise to heed that urge to just sleep. And even if they don't hold him for more than a day, at least you've gotten some respite.
I haven't been around much lately so I have to ask how long has he been on the Depakote? I'm sure you know it takes quite a while to ramp up. For my difficult child 2 it was a solid 6 weeks. Is this being rx'd as a replacement for one or in addition to the other medications?
Get some rest tonight.