Celiac Disease, Lactose Intolerant, or IBS?

I’m going to the doctor tomorrow but I’m really scared they’re gonna ask to draw my blood if I say anything about my stomach. Four years ago I went to my grandparents house and came back with terrible diarrhea and, while it has gotten better since, I occasionally, like once a month, get this bout of diarrhea but I’ve noticed that it only happens when I eat certain things like sweets, pizza, that general stuff. I’m scared I have crohns or something more severe but I’m terrified of needles. Anyone got a guess?

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