OK, so I hit with a few, and missed on some others!
The beauty of your situation is that, you want to help yourself. It's a matter of finding the right combination of things, to gain back your motivation and get that rain cloud on it's way. You said that your family has a history of depression..., disregard my comment about it being a cop out! I modified what I said about that earlier, it hope it makes more sense. Anyway, maybe the first step is to go see a doctor. I shouldn't have been so quick to close that door. I believe we have about the same feelings about it though, it's just one of those, put it off as long as possible things.
Who knows right? Go on and give it a try. Your words here radiate a sense of motivation...why else would you have posted your thoughts here! You'll make it, I can feel it! Let us know how it all goes won't ya!