I've had my Mirena since Feb. 2006. Within the past six months or so, I've had a nagging, aching lower back pain. I thought maybe it was my mattress or the position in which I've been sleeping. The pain reminds me of type when you're about 8 months pregnant...miserable, fatigued and just plain uncomfortable. I work for a gym and am very active. I even stopped exercising for a couple of weeks to see if the pain would go away, but it worsened. I, too, experience the bloating and occasional Acne but it's usually around period time. (I still have light periods every other month.) Reading these posts...it's very scary. With as much as my GYN sung the praises of Mirena, it concerns me that so many women are having such severe side effects.