did he start out with ocd when he was a kid?
thats what happened to me. i had ocd, and then it just turned into anxiety. then into what seems to be bipolar. ive never been on meds.
i just started doing meditation on compassion. this requires not worrying about anything for starters. then you naturally begin to feel compassion towards anything. it works great for anxiety, and im hoping this will cure me completely.
if you can get him to do this, then that would be great.
compassion meditation also stimulates brain growth, so that can definately cure stress, anxiety, and a lot of other stuff in the long run.
good luck.