You didn't give any numbers, so it would be difficult to comment on your "fast heart rhythm".
Is that all, a fast heart beat, or is there also an irregularity to the heart rate too? It seems he may suspect there is and if there is the monitor/recorder should give the details necessary to diagnose.
If you don't have any other symptoms it would appear you don't have anything seriously wrong... maybe nothing wrong. I have no experience about a physical trauma causing a heart rhythm problem.
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