Your post brought back some unhappy memories. I was going through a painful divorce back in the 1980's and developed severe palpitations. One night it took me to the emergency room; I thought I was going to die. The emergency room doctor after looking at my strip asked: "are you under a lot of stress?" When I anwsered affirmative he said: "You better figure it out before it kills you." I have to say that advice forced me to make some decisions that moved the process forward and got it behind me. Interestingly the missed, or extra, beats seldom occured while running but occasionally I would get a string of them, really scary, while riding the stationary bike. A cardiologist had me wear a monitor for 24 hours and told me to be sure and do a normal workout. Sure enough he got a good run of abnormal beats to examine. He was impressed and said that he was sure I could feel them but they were benign and not to worry. I recall that I was so relieved I went right out and ran some steep hills, a very grueling workout, to purge the fear from my system. After completeing and surviving that workout I knew I was ok and never looked back.