Give him water, if he'll drink it, and keep him warm. He may not have much resistance to a cold or any other bug right now, so blankets are good, maybe a hot water bottle. He'll probably be pretty trembly and weak. If he is hungry, some light food like applesauce or toast, but nothing heavy or fried---if he's been on a mostly liquid diet, his digestive system is probably quite shaky.

If he is talkative, listen, but he may or may not remember anything you say, so it probably won't help much to delve into any kind of heavy topics. Therapy can begin in rehab, it doesn't need to start on your couch.

Good wishes during this hard time.

Eiseley