My doctor’s office said white flaky fish (no salmon, no shrimp), low-fat or fat free cheeses (cottage cheese, Laughing Cow, Babybell, etc.), eggs and tofu (Morning Star, etc). They said to wait three weeks before having salmon, shrimp, ground chicken, chicken salad, etc., and three weeks after that before red meats (including ground beef).
I don’t think I’ll wait as long as I’m supposed to, but if you’re concerned, perhaps start out with tuna fish, tilapia, cod, ricotta bake, scrambled eggs, cottage cheese, and vegetarian burger or sausage, since it may be easier on your stomach.
Good luck!