Ok so if you don't suffer from terrible headaches, whether or not they are migraines, you know someone who does. I seem to have outgrown them (growing up in my 30s) but I still attest to the best defense against a jittery headache day or 2 is prevention. There's so much soft/pseudo science out here so please don't consider any of this as advice but an annotation of what has worked for me.
-Minimal soy (as in no soy milk, very little soy sauce, tofu less than once a month.
-1 Low dose aspirin AM and PM.
-Tylenol arthritis at the earliest on set.
-Reduced dairy - exceptions include hnh in coffee, goat cheese, yogurt, a bit o' ice cream.
-Sleep (the least pseudo scientific)
-At least 20 min exercise/day.
FHM Inherited Migraine condition http://ghr.nlm.nih.gov/condition/familial-hemiplegic-migraine
Migraines as recognized by the ADA http://askjan.org/media/Migraine.html