MAD HEART! No Sleep

After a fast run, my heart beats very strongly often for about 36 hours, sometimes longer.  I don't think it is beating very fast (except initially of course) and my resting heart rate while this is happening s only about 45 to 50 bpm.  However, it is a little uncomfortable and stops me sleeping properly.  It only really calms down when I don't run at all for a week or more.  I only run twice/three times a week, 4-6 miles so can't be overtraining!  Am generally fit (I think!) and do other sports. What's going on??!!

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