I took my father to the hospital on Monday, with the use of his walker he went in on his own. He was moved to an inpatient rehab facility Thursday afternoon, and he is completely out of it, moaning, major muscle tremors, and just seems completely miserable and in pain. He doesn't even know I'm there, and will most likely be moved to a nursing home since no rehab can be done at this point. Is this common for such a drastic decline over a couple days? Will he stay like this or could he improve? It is a terrible quality of life if this is how he will be.