No appetite after Whipple surgery seems to be a common problem. It took 2-3 months before food began tasting like something other than cardboard to me, and then things got slowly better. The key thing is that you need to eat, regardless of how you feel. Small meals spread throughout the day. And you need protein to help rebuild muscle and strength. The food may not be appealing or taste good, and you may have no appetite, but you wll get better more quickly if you can get good quality calories in. You may also need to take Creon or some other pancreatic enzymes to help with digestion. Hope you start feeling much better soon.