Yes this is a normal occurance in peri-menopause. Dr. Christiane Northrup, MD was on Oprah last year, and Oprah told her that her heart raced on occasion and the first time it scared her so much she thought she was dieing. She saw specialist after specialist and had every heart test under the sun done. Not one doctor could find anything wrong with her. It took a female gyn on her show to explain very simply that heart palps and racing is from estrogen surges during perimenopause. Not only does magnesium help this problem, but so does natual progesterone cream. I've had this and still do on rare occasion. I know it can be scary, but just remind yourself it's from estrogen surges and is temporary and won't kill ya!