I wouldn't presume to tell you what you should do, but I went to the gym almost every day that I was in A-fib after I was diagnosed. It seemed to make me feel better but my pulse was rarely over 110, so working out just made it feel "right" somehow. I found the elliptical machine too exhausting on some days but the treadmill was always tolerable. I think everyone is different in this A-fib condition. My advise, consult your cardiologist; mine never told me I couldn't exercise. Good luck!

When I was getting AF, my wife knew it right away because I would start belching and I'd have to get up and walk up and down our hallway while she watched TV. So, moving around usually offers enough distraction that you won't feel quite so symptomatic.
AF is not lethal. It CAN lead to other complications but that takes time and in a LOT OF AF, several hours each day. As long as you self-correct, then it means you're paroxysmal, and that's the easiest stage to manage...usually. We all vary. However, before your AF progresses to persistent and long-standing persistent, the next two stages, you should consult an electrophysiologist about an ablation. Contrary to what some might feel, or think, or read, or hear....ablation is now considered to be the 'gold standard' of care for AF. If successful, it can keep your heart from remodeling itself and from developing the later problems, often for many years. Not only that, no AF = no symptoms, and that's what tends to make our lives so miserable. So, my advice is to read a lot, watch videos about ablation and AF in general, and consult an EP as soon as you can.