Hi Katherine and Perinowpost,
I'm not sure if you've read my post on Mirena today, but I agree completely with Perinowpost. If you've any sort of Prog. Intolerence then I really wouldn't suggest it. It absolutely is systemic, there are threads on where where Hurdity demonstrates that there is systemic absorption from the Mirena. I did try Utrogestan for 12 days a month, and I had scans (2 x yearly) to confirm the lining stayed thin. My intolerence symptoms usually started around day 7, hence why I went for the Mirena as I believed I needed to take it for a minimum of 12 days. My next step is to see if the meno consultant will assist me in reducing the number days and having scans.
Good luck Katherine, keep pushing for what's right for you, I hope you get some success x