Am I lactose intolerant?

My grandmother is.
equently get flatulence, and get diarrhea quite repeatedly.
I'm afraid to tell my parents because I want to be a vegetarian, and so far I've eliminated red meat from my diet (under their consent).

Without cow's milk, I'm sure they'd create me go back.
ticed the affect milk have on me especially after a 5 day break.

I went on a 5 day university trip, and drank very little milk in that period of time. I come back, and now I have have diarrhea (worse than before) and really bad cramps (although before the trip, i didn't get cramps moderately often)!

But then again, when I hold diarrhea, it seems like I'm losing food that way.



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