Follow your doctor's advice and you will be fine. Your stomach is enflamed from the surgery and feels very tight. Eventually the inflammation will subside, and you will not feel this pain. You will also be able to eat a bit more, so be careful! Take advantage of this time, and listen to your tummy. If it doesn't feel good, then stop eating. Chew, chew, chew your food until it is like Water. You have a long road ahead, good luck! Don't stress...it is perfectly normal!