How do I know if I have Premenstrual Dysphoric Disorder?

Depression, sore breasts, irritability, angry, tired, cramps, mood swings, outbursts, crying.
Keep track of your symptoms and when they occur and go see an obstetrician.

If you have very intense mood changes after or before your period and you don't recognize yourself, you probably have PMDD.

Tracking your symptoms for at least 3 months

There are questionnaires you can take online and bring to the dr with you to help diagnose

The symptoms of PMDD are similar to those of PMS. However, they are very often more severe and debilitating. They also include at least one mood-related symptom. Symptoms occur during the week just before menstrual bleeding. They most often get better within a few days after the period starts.
Here is a list of common PMDD symptoms:
Lack of interest in daily activities and relationships
Fatigue or low energy
Sadness or hopelessness, possibly thoughts of suicide
Anxiety
Out of control feeling
Food cravings or binge eating
Mood swings with bouts of crying
Panic attacks
Irritability or anger that affects other people
Bloating, breast tenderness, headaches, and joint or muscle pain
Problems sleeping
Trouble concentrating