After my husband's heart surgery I tried several decaf brands but they were terrible. Then I stopped by McDonalds and bought him a decaf there and he said it was good. I then found the ground McDonalds decaf in the supermarket and we started using that. I would also check online for any other medications you are taking. Zantac or generic for acid reflux caused me to have rapid heart beats. I would also insist on a stress test or more tests. My husband was told his chest pain was indigestion because his blood work didn't show a heart attack. Good thing his primary care doctor kept testing. They finally found 3 blockages and he has a triple bypass 18 months ago.