HI Well come to HMC I really appreciate your concern, first thing you need to do is come out of the stress, weight gain might not be due to the surgery, of course it is not necessary to have hormone medicine, of course this may not cause any malignancy, but it may not be indicated here, try to bring back your confidence, be positive, everything would be right, try some aerobic exercise, yoga, meditation, and stop worrying, everything would be okay, hope this information helps, take care.