If it is possible for you to afford it, going to a therapist and working on weight issues can be very important. I work with a therapist and have learned that because of PTSD and abusive relationships in the past, my weight (my fat) feels like a protective barrier. Without it I feel vulnerable and not as able to protect myself. Also because my stepfather was a pediphil, I am extremely uncomfortable with my sexuality. The fat makes me look not sexual and that is psychologically comforting.
I cannot help but feel that many of us sabatage ourselves because the fat gives us a feeling of safety and protection. Also we can protect ourselves with our weight but without it we are much less able to protect ourselves.
It's so very sad but, so many of us have a ton of really difficult issues to work through before we can let go of our protective fat.