The exact reason for sadness and PMS before and during your period aren't definitively known. However, experts believe that the drop in estrogen and progesterone, which occurs after ovulation, is a trigger. These hormones reduce production of serotonin, a chemical neurotransmitter.
Following can help you
Lifestyle changes
Exercise. Try to be active for at least 30 minutes more days of the week than not.
Nutrition. Try to resist the junk food cravings that can come with PMS.
Sleep. Not getting enough sleep can kill your mood if you're weeks away from your period.
Stress. Unmanaged stress can worsen depression symptoms.
Next Steps
Consult with me or any psychologist for therapy and counseling online