Hi, I suffer with SAD disorder aswell, so I do understand how you feel, I live in Scotland so through the autum/winter day light and most definitely sunshine is minimal. About three years ago I bought myself a SAD lamp, so from the month of October through to February /March I have my lamp on, i have mine in my living room, and I keep it on for as long as I can really.
It is quite bright so best not to look directly into it. It might be worth giving it a try, it certainly works for me
As also mentioned a good multi vitamin and some relaxing therapy will work wonders!
Hope that helps. X