Feeling drained, sad, or even just sick to your stomach could be signs that your period is about to begin. In this video, Susan Khalil, MD discusses PMDD and what can be done to help alleviate the symptoms. PMDD is premenstrual dysphoric disorder and is the changes that a woman's body goes through leading up to her menstrual cycle. Managing the sick feeling you're having before your period can be a tall task, but doing something as simple as drinking enough water and eating healthy can go a long way.