Hello, bam. I'm a depressed atheist too. I'm a very cynical person too and much of what I read deals with very negative and depressing subjects-war and other types of crises affecting the world. I've come to the conclusion that there is far more bad in the world than good... and as I've written in another post there is no greater meaning to anything IMO. All we can do is try to be happy and live "morally", whatever that means to us. In the end, it won't matter much. lol
People who think they have discovered a purpose in their life are no more "healed" than I am. My way of viewing things is just as legitimate as anybody elses.
Maybe this is a good time to focus on your art. By letting your creative juices flow you'll discover something about yourself. Or not..maybe you already are? Some of the most profound things are expressed when we're depressed.