The exact same thing happened to me. Suddenly coffee, after drinking it every day all day for over 20 years, became a toxic poison. It took me 2 years to figure it out. Alcohol has the same effect. If I have one alcoholic drink I have the worst hangover. While I would drink 12 plus beers/drinks routinely 20plus years ago. Coffee though, especially cause me severe reactions including, instant headache, coughing, vomiting, and diarrhea. It really began when I left the city and moved into the forest. But that was about the same time I got married so I'm not sure what the direct cause was. Tea and coffee have the same effect unless it's decaffeinated. However, most oddly, energy drinks and soda pop have no noticeable reactions.
The noticeable reaction of soda and energy drinks is obesity.
Lol, no shit but I hardly ever drink that shit. Just don't get sick when I do.
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