I think I'm lactose-intolerant also. I can eat cheese, yoghurt and butter with no problem. But when I drink milk straight or eat it with cereal I can feel it in my stomach and I don't feel comfortable. I never have vomited or anything but I like to avoid drinking it. I read that many Hungarian people have it and even Central Asian people. Also the fact that I'm sure I was never breastfed and I drank little milk growing up might contribute to it.