That could all be the case and still not make wrong the view that this is a desperate stunt.
Oh for sure.
It's well within his locker to be a stunt. When you see the polls started to turn against him after that 1st debate, I suspect all bets are off in his thinking. He doesn't play by the same rules.
The flip of it is though, is he could have it, and actually be a fair bit more ill than he says. You wouldn't proscribe that drug to someone who was essentially fine. I mean the possibilities with Trump are very wide currently!