For me, it's the type of coffee. Often supermarket-bought coffee that's dark roasted can cause this reaction in me. Maybe it's the pesticide, maybe it's the car

For me, it's the type of coffee. Often supermarket-bought coffee that's dark roasted can cause this reaction in me. Maybe it's the pesticide, maybe it's the carcinogens from burning the coffee... I dunno. I've mentioned this to a few others, and they can now also drink coffee. If they avoid such types. Perhaps try some fresh, lightly roasted, and organic coffee to start with. This way you avoid three possible causes. Works for me.