My guess is that your situation is not helping your depression but I dont know if it is CAUSING it. I think the best thing to do is to take one problem at a time and solve it before you move on to the next one. For example, you could start by getting a new job (Which I know is easier than it sounds!) Then perhaps work on your relationship, by which time you might have enough money saved up to move out of your house. Take several small steps, not one huge one.