I just had a Mirena put in this week and I am already thinking about having it removed. It was the worst pain I have ever felt having it inserted, I was thinking to myself "if having a baby hurts like this, I don't think I can do it" and then I passed out. I did read some other forums where women who have given birth still consider the Mirena insertion their worst pain ever.
I'm taking tons of Advil and herbal muscle relaxers every day but my uterus still hurts, and I get weird pains in my back and abdominal muscles. I'm not able to be very active and if this doesn't change soon, the Mirena has got to go.
I was kind of nervous about doing it beforehand, I think I understand after having it put in just how strange it is to have something plastic and releasing hormones in your body 24/7. It doesn't sit well with me. I think it's good to listen to your gut. If I could go back in time, I would talk myself out of it.