My mirena has been removed yesterday. I had a list of unexplainable health issues, like you, including the palpitations and the numbness. I thought something must be seriously wrong with me. I also got mood swings, anxiety attacks (for which they put me on anti-depressants!) and felt like I was losing control over the left side of my body. I kept checking if I could still use my left arm. I had tingling feelings over the back of my head and in my neck. Numbness in my fingertips, tingling under my feet. Thank God I did research on the internet and found the evildoer. I hope I will recover quickly. Thank you for doing your post. It was very recognizable.