How Can Severe Depression Along With Anxiety And ADHD Be Treated?

I need help and answers bad. I m female 48 yrs old. I suffer from major depression, anxiety and adhd. My depression medications that I was prescribed made me gain so much weight that Its hard for me to walk short distances, to bend over and pick something up causes me to lose my breath quickly. I have L2 sciatica that rarely eases up and causes my legs and feet to painfully swell up and my right leg muscle hurts a lot of times. Before I was prescribed my medication for my depression I weighted 140 lbs in 3 yrs I have been on Zoloft, serabrel, Prozac and currently takin welbrutrin and bruspar for anxiety. I also take one 70 mg vyvanse in the morning and one 20mg adderal in the afternoon. My Dr said I should lose weight with the vyvanse but I haven t lost anything more then 4 lbs and that was 2 1/2 yrs ago. I was on concerta, strattera before the vyvanse I don t feel the adhd working anymore but the depression medication still causes weight gain for me. I have been watching everything I sat and drink, I have been on a high protein low sodium 1500 calorie diet and I am just putting on more weight and it is causing me to get deeper depressed and I hate myself. I currently weight 219 lbs. I don t know what to do to lose this weight, I try to push to be active and it s tough because I either can t catch my breath, my leg and back hurt, my feet and legs painfully swell up and I don t have the thrive or energy to move. I feel helpless and pathetic and my husband won t even sleep in the same bed with me anymore. please any suggestions would be honored. I feel like my body is slowly dieing and I don t have the strength or love for myself to keep on fighting so before I give up My doctor was told all of this but she said there is nothing she can do to help me and my family Dr said my blood work tests results are all good and clear, sugar, liver,kidneys, thyroid, cholesterol etc are perfect he said. please suggest to me how can I win this battle. Lynn