@lucyva Unfortunately, it's not all that uncommon. And it's also a chicken/egg conundrum where mitral valve prolapse can cause AF, and AF left to run a long time unchecked can cause mitral valve prolapse.

You are apparently in the newest, or 'paroxysmal' stage of AF where it comes and corrects itself on its own. This is the best place to be, not in the more advanced and intractable stages like persistent, long-standing persistent, and (gulp!) permanent. It is at the earliest stages that AF can be beaten into submission, for want of a bellicose term, and so an ablation is always a worthy consideration in discussion with a good electrophysiologist; the earlier the better.

Note that this is a permanent disorder and that it tends to progress, especially if not treated early. Even though it can't be 'cured', it can be stopped. The gold standard of care is currently the catheter ablation, or perhaps the MAZE or Mini-MAZE procedure done at some hospitals. It's worth reading up on all of those, plus the side effects and long-term efficacy of all the various drugs routinely prescribed to control arrhythmias.