I have an enlarged uterus as well. Mine is about the size of a 3-4 month pregnancy. I've had several biopsies; and one D & C to remove some benign polyps. I don't know why my uterus is enlarged, but I could have fibroids within the wall. My periods are heavy with clots for about a day and then it subsides. Periods last longer too. But, my doctor says I'm in perimenopause and at this point, hysterectomy isn't necessary unless I really want one. I'm turning 49 in a few months, so I'm just trying to wait it out. As far as your continuous bleeding, sounds as though you may have a hormonal problem too. Your doctor is doing all the right steps and I'm sure you'll get an answer soon. Try not to worry; an enlarged uterus is quite common.