Elana05,
Sorry to hear that you are feeling stuck. I am with you in feeling like I have had it with depression. Enough already! I've had to take a medical leave AGAIN and schedule extra therapy sessions AGAIN, etc, etc...
When I can get myself to do it, I do find that exercise is really helpful in getting past that "stuck" place... it gives me a little more energy and a little more ability to overcome inertia. It is great that you are thinking about joining a gym! Let us know how it goes.