I’ve been re-reading this old thread for a number of months after struggling similarly, doing an internet search, and wanting to add my own recent experience - to add to the picture emerging here.
I had a Mirena inserted in October 23 for HRT reasons and have had 7 months of coincidental worsening health and reduced fitness. Within 5 days of insertion my abdomen was swollen and abnormal, resembling a half concrete football, bad enough to impact driving and exercise.
10 days later I was completely incapacitated with a form of reactive arthritis, and went from being extremely fit for my age to struggling to mobilise out of bed, in pain and barely able to walk on the flat plus disabling constant hip pain. It was both frightening and shocking. I tried to work through it and didn’t connect any possible Mirena link until I did a MN search.
As another writer noted upthread, I felt older and suddenly disabled compared to my own 91 year old mother who walks for 3 hours without a rest.
I persevered for 7 months, each yoga class and swim session taking a step further backwards, becoming more and more restricted, deteriorating, literally worsening day on day, becoming finally unable to walk and in the end virtually chair and housebound. I felt like I had lost my life as I knew it in the space of a few months. I resigned myself to a new life much reduced on how it had been before.
I had the coil removed 5 weeks ago and wasn’t expecting such remarkable and positive results. At this point I was physically unable to have a day out, and was frightened to travel. Within 10 days I became totally absolutely pain free, physically active for 12 hours per day, joints fully mobilising, power walking and swimming, my life transformed.
It truly feels that I entirely “lost” 7 months of my life with the Mirena, and now feels very much that I have gained my life back exactly as it was.