I had the same symptoms a few years back. i was doing some construction work next to a timmy ho's and had like 3 a day. I also was getting chest pains or tightness in the chest.
Same with a co-worker. I didn't put the 2 together until I finished up at that site and stopped drinking there.
They have something in that coffee that is suspect. I now either drink Starbucks, or make my own in my Saeco coffee machine. I have tried it all and this id the best bar none.
I calculated it, and if I drink 1 large coffee a day, I will pay for this machine in 2 years, as opposed to buying starbucks..
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Must be the nicotine they put in there coffee lol