i haven’t been keeping this up-to-date, so here’s the update so far.
i’ve had a migraine every weekend for the past 4 weekends, with only 2 during the weekdays (6 total). one i remember was immediately after i began eating a clementine. i tried eating another clementine a few days later with no effect, so the timing was probably a coincidence. another was after i looked out the window and the sun reflected off a parked car. that one i’m pretty sure was a definite cause, since i was photophobic immediately afterwards. other than those two incidences, nothing stood out.
my go-to drug (excedrin migraine) was only ineffective once, while helping move furniture. the increased blood pressure from the exercise probably aggravated my headache beyond what the medicine normally handles.