This seems to be a lot like PGAD (persistent genital arousal disorder) in that the experience is not at all as pleasant as the name makes it seem, but rather an unending horror for those who suffer it.
I got stuck with a boner for a whole night, it fucking sucked. I didn't even take anything. It just happened. It felt like someone was stabbing my taint.
I wonder if this guy has paperwork that explains his condition. Because it isn't widely known, I don't expect any cop would accept it as legitimate. What an unfortunate situation.