Thanks for the updates.
I first experienced "vagally mediated afib" after a workout 4 years ago. To begin with, I found that exercise can actually terminate an episode. Also discovered that beta blockers can be pro arrhythmic, so stopped taking them. Now I can terminate (or often head off) an episode with Rhythmol. If I'm unsuccessful in preventing an episode, I take 300mg, put on a HRM, get on a stepper and can return to synus rhythm within an hour.
The last episode occurred on the bike (only time) about 20k from home. I just pressed on, and a couple of minutes from home, watched my heart rate return to normal rhythm without drugs.
I have been offered an ablation here in Vancouver, but have decided to put it off, as I am down to a couple of episodes a year.
I will certainly request the procedure if the afib starts to take over my life.

Good luck to any of you who experience heart rhythm issues.