Can't, or at least don't think I should, comment.
I will say this- (uhh...gues I'll comment after all.) I've seen fucked up dead people, and even my little eighty-deuce ass could hang...hard to imagine someone who had demonstrated much more tenacity, perserverance, and character than I ever had to would fold.
Who knows. Hope things work out for him.
You can only rule out an adverse drug reaction by eliminating the drug.