Eating Disorders Support Group
Eating disorders are marked by an obsessive need to control the intake and/or purging of food. This community is dedicated to those struggling on the road to recovery. Join to discuss your experience with others and find support. Get advice, ask questions, and meet others who are going through similar struggles.
Being very anxious about not fitting into things, and then over exercising does sound like an eating disorder. However, since you say that the purging is not on purpose and you are most fearful of eating anything at all, I think you may have anorexia with bulimic tendencies. Do you binge? With a bad pancreas it is very important that you take the next step in getting healthy, and I am glad you have reached out here :)
You are however suffering from loneliness and pressures about your appearance. Do you have any social support? Friends or even colleagues. I guess it might do you good to have interactions with other people that focus on other things apart from appearance and weight. The back surgery was obviously stressful for you. I hope youre getting lots of support in recuperation.