I didn’t run into the issue until post-op but I can’t have dairy at all. It’s not lactose intolerance, it’s got to be the dairy protein and it sucks! It might be that, then again it could just be the protein powder. They never made me feel great. Is your protein weight protein isolate? I think it’s theeasiest to digest. I would definitely call the nutritionist, they deal with these things all the time.