I know your post was from over a year ago, but I have an IDENTICAL experience with the Paragard IUD and the possibility of endometriosis. My periods were always heavy and painful, not to mention irregular. Once I got the IUD I just bled and bled for months (8 months, actually) and had random left-sided pelvic pain. I thought the IUD was "settling in" but it turns out my hormones were abnormal. Once they gave me Metformin to regulate my hormones my bleeding regulated, but now, after having the Paragard for 13 months, my periods are AWFUL. I have pain when I urinate, when I have a bowel movement, cough, or sneeze. Some of it is central, but the Left sided pain is worse and lasts ALL MONTH LONG. I finally have a laproscopy for endo scheduled and I'm scared. What ended up happening to you?