I'm sorry to hear that difficult child was so unstable & escalated to this level of need. I have to say I've been there done that with both kt & wm so many times it became numbing.
Take this time to recharge.
Be prepared - many times hospitals push a difficult child out quicker than the time it takes for an admit. Sadly, these facilities are equipped to deal solely with an acute situation - once medications are "tweaked" discharge is eminent. Now is the time to push for evaluations, request services (if needed or wanted), school IEP suggestions, etc.
Additionally, the hospital psychiatrist generally goes into hiding; you end up dealing with unit SW. Which is good for some things - not for others. Ask for a meeting with psychiatrist - how much time is going to be spent evaluating difficult child? Ask for a referral to long term treatment if that is deemed necessary.
Passing this along to you as one who's done this so many times I can pretty much do it in my sleep.
Again, I'm sorry for your hurt.