Scared of failing or yo-yoing again

hi all. I have done all the diets and have been down and up. I am at my heaviest and need to loose 150#. I even tried the gastric band. Lost 80 and then had to have it taken out due to so many complications. I put it all back on. I'm sure it's a stress eating and the inability to move much. Now I'm waiting for insurance to allow me to have the gastric bypass. I'm trying a "supervised" diet for the 6-month wait I have before I can do the surgery. I feel like a failure that the other "diets" worked then it came back. But, I'm going to try again. I'm 51 with a 10 year old. I NEED to do this for him and me. I don't even feel like myself. It's awful. I can I go from being a runway model to this? I guess I just needed to vent. Thanks.