Background - I can't say for certain that I have endometriosis, but in the past, my periods have been extremely heavy and accompanied by significant pain and discomfort. My reproductive endocrinologist "presumptively diagnosed" me with endometriosis - basically, the symptoms and inability to get pregnant pointed in that direction, but there was no need to do the laproscopic surgery to confirm diagnosis because I was going to do IVF, in any event. (That was a few years ago, and after 3 egg retrievals and 4 transfers (3 fresh, 1 frozen/thawed), I had wonderful twin daughters.)
Since W30 - Since my W30 and sticking quite close to W30 rules post-W-30, my periods have been lighter and much less painful. No pain meds, no heating pads, no curling up on the couch!
Good luck to you, Megan. Hopefully you'll experienced decreased pain soon!