I can relate to a lot of what you said... I have also experienced those extreme lows and feelings of exhaustion about a week prior to my period. When I would start to feel that way again, I often wondered what my problem was! But, then my period would start and I would understand. I almost looked forward to my period starting because my "mood" would improve! I started taking a supplement back in March, and it has really helped me in this area, as well as with my headaches, migraines, allergies, and IBS symptoms. If you are interested in more info, let me know... Good luck to you!!!