Peekay - I had my lap on about CD10 I think... and found that I O'ed about CD 18, so had a slightly longer cycle than usual, but it was back to absolutely normal the next cycle. I had endo/adhesions removed and felt quite sore for a few days post op though. So I can't say for sure how ovarian interruption would affect things.
I do hope they warned you about AF being a true horror the first one post surgery. All the women I have heard from, including myself, have corroborated the misery of this event.
Hope things even out very soon for you.