I was recently advised to try yellow tinted lenses for treating my mild ADD. It has so helped my focus at school and work I have cut back on the caffeine. Two other immediate effects were it helped my night vision, making night driving less scary for me, and the Gray Blahs that have plagued me for years on cloudy days just about evaporated. Goodbye, SAD!
If you do not need glasses, go to the nearest sunglasses store and see if you can get glasses with a yellow tint. They may have them at sporting goods store for gun users, as well. If you wear glasses, as I do, adding a yellow tint is not expensive and well worth my money. I believe it has helped my drawing, too (artist/student).
If you do not like the yellow tint, I knew a lady who wore rose-tinted spectacles on grey days, because they made the sky look blue.
Some people swear by "light boxes".
The sauna treatment doesnt sound bad, either!