Plastic Surgery for Someone with a BMI of 40+?

I'm still fairly young (early 20s). Most of my weight issues seem to be hereditary. I also have asthma, and have dealt with depression due to other reasons other than my weight. I have tried exercising (though with difficulty due to asthma) and dieting since I was in my early teens and have lost very little if any weight. The majority of the weight is around my abdomen. I am looking at doing plastic surgery on the abdomen, back, upper arms, under my chin, love handles, and thighs. Realistically, I would be doing this at separate times. Would you recommend it?