I'd be going pretty soon with a heart beat that high.

I'm not an expert in this, but we at affibers.org forum routinely tell people who ask such questions or who post such circumstances that the conventional wisdom is to not be in any kind of tachyarrhythmia for more than 24 hours if the rate is deemed to be higher than 100. The arrhythmia might be temporary due to some underlying condition....which SHOULD BE figured out by a competent person, usually a team of nurses and physicians. I mean, how long should 'temporary' be?!?

Just my opinion.

You can always call your ER and asked for advice of what to do.

I am not a physician or nurse, but my husband is an ER doc of 28 yrs. I, too have afib. He has told me that sometimes people come into the ER saying, “My Apple watch says I am in afib! Do something!” And he says there is nothing that can be done for them. There’s no way to “break” afib. He also told me some people live in Afib all the time! So take this advice with a grain of salt given that it is second hand advice. But I would go by what your NP says. Best wishes.