I am so glad to know that I am not the only one that feels like I...

The brain fog for me was one of the most disturbing side effects. I thought I would lose my mind, if not my job. I couldn't remember what I did the day before and would find myself stopping mid-sentence because I could not remember what I was going to say!! I could tell the difference right after removal...while walking to the car...it was like one of those Claritin commercials where they peel back the film. It took about two weeks for it to leave completely...but my concentration, memory and clarity came back. With me, I ended up being diagnosed as POST-menopausal 3 months after removal (at age 43) because I never had another period and started having hot flashes. I am now taking transdermal estrogen and now I know that when it's almost time to change my patch, I can get tired/forgetful....although nothing like I was on the Mirena. This leads me to believe that the Mirena was disrupting my normal estrogen/progesterone balance...too much progesterone/progestin can give you headaches, make you feel "heavy"....and I further discovered that I could no longer take my allergy medication (Allegra) because it made me feel like I had concrete in my head! Once on the estrogen, when I started taking the Allegra for the spring allergy season, my legs swelled up....this had never happened before....so no more Allegra for me. Good luck and take care.