I've had Arrythmia on and off for years but the worst bout has been for the last two weeks - I've felt weak, had trouble sleeping and when I did the nightsweats were dreadful. I tried the usual ACV/Bicarbonate of Soda and all the other remedies suggested here and this time nothing helped. So more because I was too exhausted to cook than anything else - I bought Bran Flakes for something easy to eat and would you believe within minutes I am completely back to normal. After investigating online to see what could have made Bran Flakes work when nothing else would - the only thing I can conclude is it's the Magnesium content. And although I'd already tried Magnesium supplements without success - whatever it is about Magnesium in Bran Flakes - it worked almost immediately.
Hope this helps others.