Could be an initial surge of progesterone?! I got phases of fatigue while I had the Mirena.
There are some nasty low grade viruses going round at the moment. I had a 48hour virus last week that came out of nowhere - I felt shattered for 2 days - felt slightly achy, hot and cold but no other specific symptoms.
I know some women react to the Mirena but it's generally well tolerated. It may settle down.
Give it a bit more time. Dg x
