good question, and i'll attempt to answer that now.
first, bear with me for some recitation of reasonably accepted facts, both general:
-women are 2-3 times more likely to suffer migraines than men.
-seratonin and epinephrine (our old friend adrenaline) levels are a factor in depression, migraine, ADD/ADHD and nearly countless other disorders.
-many women report that their migraines happen in relation to the menstrual cycle, which suggests a hormonal link...as does the fact that birth control pills often increase the frequency and/or intensity of migraines.
and information specifically related to migraine symptoms (or possibly precursors, at least to the actual pain):
-sensitivity to light
-drowsiness and or insomnia
-loss of appetite
-mood swings from depression to euphoria & back...or sometimes just one or the other
okay, so no answers yet, and i need to go do other stuff right now...but there is a LOT of information above (particularly if you follow my links). let me just add, before i take an extended break from this, how pleased i am at the amount of material (reputable, no less) available to link to. even as recently as a couple of years ago, this stuff was almost impossible to find.
i'll be back, eventually, with part 3.