I have the mirena too and my ovaries actually cleared up whilst I had it although I did just have PCO not the syndrome (I was misdiagnosed with PCOS a few years ago) so I don't know if its different but it certainly didn't make my cysts worse. My ovaries cleared after I completely cut out sugar and upped my exercise.
As far as the endo goes it is very much trial and error, there aren't many pills and potions that really work long term but certain lifestyle changes could help such as exercise and nutrition. I have heard that tens machines help and I swear by heat pads.
You will find heaps of hints and tips from the lovely ladies on this forum.
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