Help! i have no idea whats happening to me!!!?

Maybe you're lactose intolerant to some degree? Milkshakes and ice cream are made with 2% to whole milk. What kind of milk did you drink? Was is skim or fat free? I react like that to anything with more fat than skim, it may be the same for you XD It's because I have a hard time breaking down those fatty lipids in high fat milk. :/