eat sugar headache afterwards!

The last condition that needs to be mentioned is reactive hypoglycemia. This is a very complex metabolic condition which was considered a psycho-somatic condition 15 years ago, but has recently been found to have an endocrine basis. Dysfunctional release of insulin, and its anatgonist, glucagon, appear to account for the rapid drop in blood sugar which promotes the headache. The drop is triggered by eating refined sugars or alcohol, even wine. Avoiding sweetened drinks, orange juice, candy bars, liquor, etc. is likely to prevent these responses. Substituting complex carbohydrates such as honey, or using artificial sweeteners are common avoidance solutions. Another symptom that commonly goes with reactive hypoglycemia is a sense of internal jitteryness, or even tremor that is relieved by eating. The real answer to this condition remains to be found, but I have treated many women successfully by having them eat a half-dozen almonds, or other nuts (gotta be careful to not get too many calories from this) in anticipation of the symptoms, say 2-3 hours after a meal. This provides protein that stabilizes the blood sugar levels. I have long recognized that eating small amounts of food frequently, rather than large meals, is another way to reduce such events.

http://www.stanford.edu/group/whpu/qa/07,06,99.html