I'm 9 months post and still struggling too with neurological symptoms (trying to outrun the fear that I have Parkinson's or something). I'm mostly bothered with shakiness, increasing weakness in my right arm/hand (and slightly in my left arm), and the foggy head. I'm having my period right now, so it's all very pronounced. I had some intense facial twitching on the day my cycle started, but it's a bit better now. Tendonitis in my right wrist also came back this week for no reason. This was my first symptom after Mirena was placed, and the first one that left after removal. I don't know if I have an actual autoimmune or other disease, but the Mirena is definitely a factor!
I am trying some herbal remedies recommended by Hveragerthi on his Truth in Medicine forum. Addressing adrenal fatigue especially.
Good luck ladies! Time to stop typing since it's hard to control my right hand :)