When you are stressed, the neck muscles tense. Physical stress, for instance sitting for hours at a computer, driving long distances Memory Repair Protocol or insomnia, can have the same effect. This can cause the circulation of and blood to slow down. Particularly the supply that flows through the vertebral arteries. If this happens, the system suffers from 'Power failure', as its fuel falls to get through. Other parts of the brain may also be affected, so you might get a craving for sugar because your glucose supply is reduced, or suffer panic attacks, headaches or chronic fatigue.

Just before a period starts, there is increased pelvic congestion as the uterus swells and more blood rushes to the area in preparation for the imminent loss. This causes the blood supply to the brain to reduce. If, in addition, the blood supply to your brain is compromised because of tight neck muscles, even less blood gets through. This causes all the symptoms associated with PMS - anxiety, headaches, dizziness, mood swing, memory loss, lack of concentration, and so on. After a period, the stocks of blood are depleted too,
In order to relieve your symptoms, I suggest you change your lifestyle for the second half of your cycle:

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