Premenstrual dysphoric disorder (PMDD) is a condition in which a sufferer experiences debilitating depression, mood swings, insomnia and various other symptoms in the luteal phase of your cycle, which is after you ovulate until and sometimes after your period starts.[1] It usually disappears when the period arrives, or shortly after. It is more severe than the well-known premenstrual syndrome (PMS) and it can cause a sufferer to change the way they live so dramatically, that even work schedules and relationships are negatively impacted.