insecure about my body

2 summers ago I weighed almost 100 pounds. since I have been at my newer job I am not as active and have gained a ton of weight. well I'm starting at a new job Monday and I got results from tests today and it said my bmi is almost obese. I have heart problems. it is super hard for me to lose weight becuase of my condition. I'm super active in the summer but I stopped and looked in the mirror and just cried because of my weight. this now has ruined my self confidence and can't stop crying. guess the bullies were right all through high school....