For my first 3 or 4 rapid AF events, I was so scared about what was happening I tended to stay as still as possible, afraid to move. On the 4th or 5th admission to the emergency ward, a nurse decided to adjust the trolley/bed I'd been on for several hours. There was a jerky sudden movement as he did so and the AF stopped at the same moment.
I always feel the sudden onset of my AF and likewise when it ends just as suddenly, often after about 3 to 7 hours.
After that experience I've been less scared of movement, and in fact make sudden movements on purpose in an effort to stop the attack. The other thing, which seems to stop some AF events very quickly in the early stages is to cough. As hard as I can. Often when I do that the AF stops before it gets a hold.
The only other thing I've noticed is that the last attack (which lasted some hours as I wasn't able to stop it by coughing) started immediately after I'd yawned. Other than that there was no obvious trigger as I'd just been sitting on the lounge watching TV at the time.
Don't know if that will match anyone else's experience, but I'm throwing it into the discussion in the hope it might help someone.