I have been reluctant to post this because I assume everybody will have seen it. But everybody will only see it if everybody cross posts it. So here goes.
This is remarkable: "Depression Part Two" at Hyperbole and a Half". Warning: like many links from here you might not find it a comfortable read since it has a lot about the inside of feeling depressed and some discussion of suicidal feelings.
I particularly empathise with the line "I don't necessarily want to kill myself, I just want to become dead somehow." Though I don't want to kill myself, the thought of not being around can be quite comforting. That is even though - as now - things are going quite well and I am only rarely miserable.