Hi, this is Doctor H and I would be happy to assist you.
I know it's probably abnormal for him to be doing this, however he may still be out of it from the anesthetic episode.
Do you know if they gave him any pain medication prior to recovery?
Okay, good. He's likely dysphoric (out of it) from the anesthetic episode. I would recommend keeping him in a dimly lit room that's quiet and away from other animals/childredn.
Offer him small amounts of food and water as you have been doing.
He should be back to his normal self by tomorrow morning.
Do you have any other questions or concerns about this?