Not new to this, had it a few times within the last 8 yrs. once it went away by itself after 2 days.
2 times I had to be cardioverted (electrodes), 3 weeks ago it went away with „pill in the pocket“ (flac), which comes, like Monty said, with some magnesium and Kalium to kick in better.
Most important is to know what’s going on and not just training or racing with it while having an episode. I’m on daily pills for years (blood thinner,blood pressure,heart rate you name it) which doesn’t have any negative effect as far as I can tell.

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-shoki