I'm tentatively wondering if this might be a possibility for me.

I live in a very dark part of the world and have now been taking vitamin D for the better part of a month. (It's also summer.) And I feel a lot better. Whenever I fall back down, it's highly possible that I just missed a dose. So I'm finally starting to allow myself a bit of hope that maybe I won't have a major reoccurrance. It feels very strange, and I'm kind of scared I'll put too much hope in this one little pill, then it'll all disappear again and I'll feel even worse for having hope. Ya know? I tend to have low and high points anyways. But so far it is very helpful.

It also makes me very aware that depression is a very common symptom for other health problems. I'd suggest people (especially newly diagnosed who haven't been trying these things) check with their medical doctors to rule out these causes.