I've had mirena for 4mon (had one put in in january which fell out in april and reinserted 2wks later). i've had my period for over two weeks now, with days where it's more painful than it has been since i had my endo excised in january. what gives?

Painful menses: Any IUD can be pushed by uterine contractions into the narrow canal of the cervix, where it can cause bleeding. Since your IUD was replaced after some time in April, you should obtain a serum HCG test to make certain about possible pregnancy. If negative, see your gyn and consider oral bcp's, which work much better with endometriosis to reduce painful menses.