Transcutaneous Auricular Neurostimulation (tAN) for Premenstrual Dysphoric Disorder (PMDD) and Perimenopause

The PMS/PMDD study will last four menstrual cycles, for an average of four months in length. The first cycle will be baseline (pre-treatment), the next two cycles will be intervention (treatment), and one final cycle will be follow-up (post-treatment). The perimenopause study will last three months. The first month will be baseline (pre-treatment), the next month will be intervention (treatment), and the final month will be follow-up (post-treatment).