Get professional help, dude. I had undiagnosed depression for years, and at the very least you need an impartial professional to offload onto sometimes.
This may work differently for you, but the way I saw it, my depression wasn't caused by the situation I was in, but rather the situations exacerbated the problem. So even if I got out of bed and "did stuff", I still felt depressed.
I needed a "two-pronged" attack, giving myself and my daily routine some structure, as well as getting medication to inhibit the breakdown of serotonin in my body. I came off the meds a year ago, and I've never looked back - sometimes you just need a kick start.
I wish you all the best with what happens. Make sure you talk to people.