Welcome to FitDay and the forums.
I'm not likely much help on the personal problems (which I hope get resolved for you sooner, rather than later), but you really can't let them control your health goals.
Even on a limited food budget, one can make better food choices and practice portion control. As far as exercise, it's tough to beat walking. If you can't go out, even walking in place.
In any case, make your plan and get to work--you may find that by working toward your health goals you get the energy and mental state you need to work towards sorting out some of your other problems.
47 M 5'8"
May 4, 2010...... 440? lbs. (Start FitDay Size 60 Jeans)
June 19, 2010.... 393 lbs. (First Weigh-in)
June 19, 2011.... 229 lbs. (164 lbs. gone in one year :-)
Current Weight... 185 lbs. (Size 36 Jeans)
Next Goal 169 lbs. (07/04/12)
Ultimate Goal 165 lbs. (12/31/12)
The best exercises for weight loss are Fork Putdowns and Table Pushaways.