Hi Jaq69,
I also had Mirena fitted 3 months ago. I suffered from lower back pain after it got fitted for a while. It was strong but I cannot describe it as shooting or stabbing pain, more like joint ache. Heping my 6 year old in the bath was agony.
Not sure if you were on HRT before Mirena. I was. What I find now is I need more oestrogen. I was settled on HRT, but Mirena upset the balance.
Hope you will feel better soon.
Nicky_boo