I've had afib for about four years now. Mine seems to come on after I eat- I gas up, start belching, and then afib starts and last several hours sometimes. I was in the the hospital on a monitor and overnight my heart was steady- next day when I ate, my heart rate went to 160. Its done it several times when I'm out on my bike. Once I went out about 10 miles, drank some ice water, then 15 mins later gassed up, started belching, and went into afib. My cardiologist wants me to have an ablation, but I think mine is due to a hiatal hernia and reflux. I just went today for barium swallow test- the radiologist said I may have a small sliding hernia that could cause reflux. I can't post a link but If your have reflux , stomach problems and Afib, you may want to search for this video on youtube.
Association Between Hiatal Hernia, GERD, and Atrial Fibrillation by Dr Suraj Kapa www jafib com