Generally I think a complete life overhaul for a couple of months would be worth a go. It might turn out that the condition is environmental rather than medical. Or it might not. Either way, it's probably worth finding out.

You could try looking into what this guy promotes: www.marksdailyapple.com - basically trying to eat and exercise in a way vaguely similar to our caveman ancestors (or at least his interpretation of our caveman ancestors).

And if you can go somewhere sunny for a few weeks that can't hurt either.