Not only coffee w/caffeine but so-called caffeine free, any cola's, hot chocolate, tea, anything with a hint of caffeine in it is out for me. It would cause me to have major heart palpitations or the feeling I was about to jump out of my skin. 
Caffeine put me in intensive care for a couple of days, then I was placed into a regular room, the doctor (with a heavy accent) would ask me two to three times a day, how much coffee you drink, how much tea you drink? At that time, I didn't drink coffee or tea. So they finally let me out with a prescription of valium. 
I didn't take that but one day because I was knocked out after one pill almost the whole day. That was it for me.
One day I found out where I was getting the caffeine from (reading the label on the bottle while on the phone), I was drinking 8, 16 once Pepsi Cola's a day (when a case of Pepsi's came in a carton of 8 bottles). 
Today, I mostly drink water and maybe a cup of decaf once or twice a month. 
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