My friend had almost the same issue as you, he worked with his doctor to find a program that fit with him and helped him heal and become a larger size that he was happy with. Odd isnt it that men want to be bigger and females want to be smaller? I would definetly check with your doctor. Have you checked into herbal teas to help ease stomach pain? I cannot stress enough though talk to someone in the medical field who knows what the are talking about, really knows. Because they can probably get your stomach able to except food again and find you a healthy way to gain weight. No offense to anyone on here or you but most people that work at GNC dont know more than they are told so if thats where you got your advice remember that they are trying to sell a product. Where as a doctor has your health in mind. Best of luck