I then realized it was the coffee I was drinking every morning. To test my theory, I switched from morning
coffee to morning tea (Black tea). My
stomach flu symptoms stopped. This morning, without thinking about it, I drunk coffee. Half-way through the day, my "stomach flu" symptoms returned.
Is it possible to just be allergic to the coffee itself? I drink sodas and caffeinated teas often without issue. Why the sudden allergy to coffee? I've drunk it for years without it.