I have an irregular heart beat that comes out of the blue, also some times it beats very fast for several hours, happened quite a few times but its still scary when it does happen especially if its coupled with an irregular beat at the same time. Had all the checks done and been told theres nothing they can see wrong with it, just one of those things.
Yep although ive never had hours of fast beating, sometimes i can feel a strong beat after a pause, they are quite odd sometimes, make your body shake a bit when your in bed!
I went for allsorts of scans and ECG's etc etc. Just told to live with it...
Some say that it may only last a few years then rectify itself, others live with it forever.
Just out of curiosity, does yours go regular when exercising?