Why do I feel sick after eating dairy products?

I don't really have any symptoms for being lactose intolerant, except the fact that I do feel sick after consuming dairy products sometimes. I especially get sick off of milkshakes. I'm fine when I have a small blizzard at the dairy queen but when i get a medium it makes me sick. I can't seem to eat cereal for dinner much anymore because it makes me sick after a while. Could be my body is just building up a mild

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