Hi, I am a 36 year old female, 5 5 , 143 lbs. I haven t been on *any* prescription drugs in years! About a year-and-a-half ago, I started experiencing heart flutterings, usually around night-time. My online research of the subject yielded sketchy results, so I decided to just work out more. I figured I was out of shape, though I usually eat healthy. And, I haven t experienced heart flutterings since then; but tonight, while sitting calmly at the computer, my heart constricted for about 5 seconds or less. It was a sharp pain, and I could feel it branching out (possibly nerves connected to heart?) and the sharp pain reached all the way to my back. My back now has a dull pain in the area right behind my heart. What could this be? I have neglected my workout routine, for the last six months. Thanks for your help.