Relax. Get a job at the supermarket, or anything that will pay the bills for now. Figure out your main gig slowly on the side. If you share more about your freelancing work, people here might be able to help you out.
There is nothing wrong with taking a position where the work doesn't really require much thought or have great prospects down the line. It doesn't sound like that's what you need right now, you would beenfit from some time and a bit more security. Then use those free eveings you have after work to figure out what's next.
I thought that depression was the result of a chemical imbalance. It might be worthwhile to seek the help of a healthcare professional to help treat it before it gets any worse.
Lots of credulous suckers think that. Might turn out to be true eventually, but for now, we just don't know: http://en.wikipedia.org/wiki/Chemical_imbalance
20... no job, no ambition, no problems.