Milk intolerance - How do you know you now have this post-op?

I have been using Optimum Nutrition whey protein powders, and mixing it with skim milk. The last one I drank I felt EXTREMELY nauseated afterwards. I tried another protein drink (this one was already mixed and bottled) - Carb Solutions. I felt it to be a good choice because it has less sugar than the skim milk I've been using. I just drank all I could from one bottle (about 6-7 ounces) and became so ill I threw up for the first time. I mean I hurt in my gut really bad! I read on the packaging and found that the protein in Carb Solutions is from milk protein concentrate. So... is it possible that I can not tolerate the milk? Pre-op I loved and tolerated milk. Any info on post-op milk intolerance would be helpful. Thanks.

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