Yeah, that's the worst part of depression...there is no reason for it to exist but it does. I'm coming to understand, after wrestling with depression for years, that it's more a product of environmental influence on the brain than anything else. For example, the changing of the seasons and lack of sunlight can trigger it and/or make it worse.

I'm only learning now that there are some physical factors that I can control that seem to have worked in getting rid of it. For example, I have stopped consuming caffeine (haven't had caffeine since July) and have been drinking only water (and limiting stuff like chocolate, which has trace amounts of caffeine in it). I've started taking fish oil vitamins daily and a multivitamin. I've cut out most of the greasy foods I used to eat and drink a smoothie daily. I now do work that I feel is important and makes me feel good about myself.

These things seem to have made the depression go away. I still get traces of those feelings from time to time, but when it comes on me it doesn't overwhelm me like it used to and I can usually pull away from it pretty quickly.

I would suggest trying those things for now and giving it a solid 2 months before deciding if they work or not.