Rest up, Joseph. You don't have to do anything, and the project's always back here for you to work on.
That said, if it makes you less depressed to be productive, then I hope you can push through. I know it makes me less depressed when I create some stuff in my game and it feels like I've accomplished something. But if it burdens you rather than energizes you, my advice would be to take a break. We're not going to run away while you're gone ;) At least I just want you to be happy and fulfilled. Do whatever it takes ^_^