Here's a great article from another site I'm on, lots of useful info - Palpitations and Your Period http://www.skippinghearts.com/articles/palpitations-period-pvc-menstruation/ if the link doesn't work, just google skipping hearts forum; the article is on the front page
I suffer severe endometriosis & adenomyosis as well as arrhythmia's and found some very valuable info in here, as well as followup reading on the research done and articles at the bottom of the page.
It's true - "The medical community just collectively pats women on the head, says “everything will be ok,” then sends them on their way." I would find another EP and see if another ablation is right for you.
I have the same exact problem myself. I am sitting here at work right now wondering why in the hell this happens during my period. I had talked to my cardio about it and he said that there really hasn't been enough studies to warrant the hormone relation to the pvc's frequency, but, as many times as I have seen this same exact scenario on this forum makes me believe why waste money on a study when the facts are right here! I know it is very scary - I panic to the point sometimes when I have 2 in a row I get flush, lightheaded and my hear will pound afterwards, but, I like to think that is just me freaking out and nothing else. I do worry also because my cholesterol is a little elevated and I think about that factor as well. But, all in all, In regards to the menstration - and also indigesion - they are very much so related - how can they not be - the proof is on the forum.