"Just don't ask me to give up my coffee, people might get hurt".. Supton,I've been on decaff for 3 months I was exhausted after a stomach bug gave me the dry heaves for a night. I slept for an entire day. Caffeine withdrawal headaches are caused by restricted blood vessels expanding to their normal size. I take 2 vaso dilators, a side effect is a dull head ache same as coffee withdrawal. I tapered off and went from 10 cups a day of French roast to 5 cups a day of 99.7 % caffeine free Folgers Black Silk. Same taste, just no caffeine. Black coffee with Goslings Gold Seal Rum and vanilla ice cream Is a delicious drink