Headaches

Poor diet, caffeine, sugar, spicy foods and food allergies, can all lead to Headaches.  Other Factors are stress, tension anxiety, constipation, poor vetebral alignment and even perfumes.  

Pre-Disposing Factor
1.  Food Allergies
2.  Poor posture
3.  Anxiety 
4.  Psychological Stress
5.  Poor Digestion
6.  Hormonal Imbalance                

Supplements that may help:

Supplement               Property of Supplement
 

Feverfew Vasodilator and Anti-inflammatory Properties
Valerian May help to reduce stress
Lavender Inhaled to promoting calming
Calcium - Magnesium For a relaxing affect
Chamomile Flower Stress relief
Co Q 10 May improve oxygen flow

References:

Enhancement of human performance by caffeine and the amphetamines. Weiss B, Laties
Insomniacs give up stress and medications.  ML Fuerst  JAMA
Complete German Commission E Monographs Therapeutic Guide to Herbal Medicines.:  M. Blumenthal   WR Busse,  A. Goldberg 
Natural Health Natural Medicine by Andrew Weil.
Herbal Prescriptions for Better Health.  DJ Brown
The Nutritional Protocol Manual  Third Revision