Hello:
My first recommendation would be to drop the "stupid gym membership" attitude.
Depending on your level start slow but DO something. Even walking can make a HUGE difference.
I walk almost everyday and try to do squats, sit-ups, push-ups, etc.
The key is doing it.
Exercise is really great medicine for the body and for the soul. I am happy that you want to get this going.
Keep us posted on your progress.