If you qualify for the surgery, then I think you should go for it as long as the doctor agrees. I heard though it's very important to deal with the psychological issues around weight. If they don't, then even when they lose the weight, they still feel overweight inside. Weight is two fold -psychological and physical.

I think it's very sad that your family teased you about your weight. Our homes are supposed to be a safe haven. I assume you can't do the standard exercise - how about water aerobics? Can you manage walking? -sorry I don't know if you're wheel chair bound or not.