I had my surgery the same day. My Dr gave me Previcid Solutabs to keep the heartburn under control. I too have been belching up a storm, not to mention the passin gas. My family calls me the musical sleeve! Dr told me not to worry so much about the protein the first week, but to concentrate on hydration! I really haven't had much protein as I'm on clear liquids and I think Isopure tastes like vomit! I the best thing I have tolerated is pop cycles and egg drop soup sans eggs