I have definitely determined that I can no longer have cheese.  Within a few hours of eating cheese, I develop a headache. I am not sure however, that it is lactose that is causing the headaches. Normally for me, high doses of lactose just disrupt my GI tract. I am still researching this.
I also found a list of foods that are known to cause headaches. Here it is:
- Ripened cheeses
- Herring – pickled or dried
- Chocolate
- Anything fermented, pickled or marinated
- Sour cream
- Nuts, peanut butter
- Sourdough bread, breads and crackers containing cheese or chocolate
- Broad beans, lima beans, fava beans, snow peas
- Foods containing monosodium glutamate (MSG) – soy sauce, etc
- Figs, raisins, papayas, avocados, red plums
- Citrus fruits
- Bananas
- Pizza
- Sausage, bologna, pepperoni, salami, summer sausage, hot dogs
- Chicken livers
- Alcoholic beverages
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