You're probably either lactose intolerant or have a milk allergy. The same thing happens to me (I have a milk allergy). I would suggest getting tested by an allergist and avoiding dairy products (soy is good, I promise!).
P.S. This can suddenly happen (ie. you go your whole life eating dairy and all of a sudden you're allergic to it or have a lactose intolerance).
If you happen to NOT be allergic to dairy, but instead of an intolerance, just eat less dairy at a time and take a dairy aid pill.
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