There's some great info on this page. I've had arrhythmia for ten years. It would lay me low for a day or two at a time. I'm 57. Eight months ago, I agreed to an ablative procedure after being assured that it would be a simple process with a 2-3 day recovery. Well, the surgeon miscalculated and burned a hole through my heart wall. He had to return to the hospital five hours later because I was bleeding internally and near death. He also misjudged the emergency op that was meant to relieve the internal hemorrhaging issues and did considerable damage to my heart and lungs - all this done by going through the chest wall with a wire; this was not open heart.
Long story short, I spent three nights in the ICU and three months near death in bed at home. I'm am still very unwell. My point is not to scare anyone, but I highly recommend trying every natural therapy you can before taking what seems to the quicker route, no matter what the "experts" tell you: problems do happen. The clincher is that I still have arrhythmia and, after things went so terribly wrong, the surgeon dropped me like a hot scone, probably, I think, because he was worried about a law suit and hoped I'd simply disappear.
Although I have Obamacare, the insurance still hasn't decided whether they're going to cover the bill for the ICU - $120,000. And that's just the ICU bill - I have thousands more besides. The surgeon has gone a long way to ruining my life, although he does have a couple of very expensive cars.
Anyway, try magnesium first - "Calm" is a very good product as it doesn't have as many side effects as others I've tried, and it is easily absorbed.