I suffer from A-Fib. I have it 24/7 but I have cut it down to a smooth rhythm with just a salt tablet, plain sodium chloride tablet you can but OTC or online at Amazon. I got the idea from taking liquid hydration for muscle cramps and running to the bathroom hoping I would not leave a trail. I think it was due to high potassium levels & not enough sodium in pure form in controlled amount but it did what no MD could do in a day, no less, it started to smooth out, it`s not perfect but vast improvement.
A foot note, US Soldiers in areas of high temperature in SE Asia had to take a salt pill every day to keep from dehydration & an anti malaria pill hydroxychloroquinee daily to prevent malaria. No reported side effects either.