He's had problems with pain meds before. Easy to jump to that conclusion, given his recent surgery.
Hope he recovers ok, and gets help if he needs it. Glad nobody else was hurt.
As someone who has had a surgery decently recently, and was given real pain meds for the first time, I can tell you holy crap, no way can I trust myself on that stuff, knocks you on your ass.
I am glad he seems to be alright, and hope it's nothing more (or not even meds related)