No accountant wants to believe money won't make you happy, but a lot of 'em burn out.
You probably won't like my advice. Your job is eating you. Get a new one, working for a non-profit you believe in. Take the pay cut if you have to, scale back your expenses, and get out of the house more.
Find a social hobby. Something fun. Ever taken a cooking class? You're looking at changing your eating habits, anyway. Ask the nutritionist about a class.
Weight gain is often linked to stress. Stress can be released through exercise, which introduces endorphins into the body. If you don't already have an exercise program, that's the best place to start. If you want to meet somebody, that might be a good place to do it.
The biggest thing is, though, to make a change.