Common stuff.
Search under Atrial Fibrillation on med sites (Web MD, NASPE.org, Scientific American). Treatment steps are pretty standard everywhere.
Decongestants can trigger it, as can chest infections and about 40 other things. On the other hand, if you are out of rhythm for a while, going fast, and don't know it, it can cause fluid build up that mimics a chest cold....or worse.
Good luck with it all, it should turn out OK.
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