Fatigue from nervous headaches, migraine and allied conditions. Nervous headaches are usually brought on by a physical response to stress and can be disabling. Migraine headaches are periodic, throbbing headaches that usually start on one side. They are brought on by a variety of causes, often certain foods. The trigger differs from person to person. With persistent headaches, it is wise to see a doctor to make sure there is no organic cause. Sufferers from nervous and migraine headaches may be helped by Combination F.