Have you tried a light box? If you can get one and spend enough hours near it every day, that should help lift the depression enough to get you thinking clearly and on your way.

I live in Florida, which I think is populated with a lot of undiagnosed cases. Once in a while, in the winter, we get a few overcast days and people are crawling up the walls. One of the big advantages of heading south is not just the increased sunshine. Having days that don't vary in length so much between winter and summer really helps a lot.