I have had AF for years (I'm 67) and it is slowly becoming more frequent but it is very predictable. Palpitations start every 4th afternoon like clockwork. Until recently they lasted for 48 hours then I had 48 hours free. I was then diagnosed borderline diabetic so went on a low carb diet and lost 2 stone (BMI now27). I also started taking magnesium (2x125). The palpitations are still every 4th day but only last 12-24 hours. Interestingly my blood sugar is now down around 5.3 but is 6.8-7 on days I am in AF. Am on Xarelto and Nebivolol 5mg which slowed my heart but higher doses of it and Flecainide didn't alter AF. I feel sure something is triggering the AF but it is not coffee, chocolate, alcohol or blood pressure or cholesterol and Dr says the blood sugar rise is an effect of AF not the cause as the level is low in the morning before the AF starts. Does anyone else have this sort of pattern and any ideas on other possible triggers I could investigate or supplements to try?