This is when you are too much in Caffeine Intake ...You cant Sleep well at night. You feel really anxious and Heartburn..I experience this symptoms if i take 2 cup of coffee in a day. My cardio said that i need to cut My Coffee intake because its bad on my Health . I have Mitral Valve Prolapse my Heart valve is not allign or its not closing perfectly so the Symptoms is really scary sometimes like you are having a heart attack.