OMG, how scary for you and your son!!!
I'll say a prayer for him and please keep us updated on his condition. I worry too about my son, he is 16 and so skinny. I keep an eye on him healthwise all the time. That God you were with him with this happened.
Maybe you can rent him a laptop or some videos while he's in the hospital or find other ways to keep him from getting bored. Poor guy, I hope he's back to his ole self real fast!!