I've got a Mirena too, and it changed my life. According to my doc, a lot of women get heavier and heavier flow (instead of lighter) as they approach menopause. My mom was one and so was I. I couldn't be away from a bathroom for more than 30 or 40 minutes, which means you have no life. You can't drive very far, You can't sit through a movie, you can barely hold a job, and you might as well write off having a sex life.
Honestly, if I hadn't gotten it, I would probably be on disability by now. Instead, I'm able to be very active and keep up with the 20-something guys at work.