I have problems with flashing lights too. Whether it's fireworks (some are just terrible for me), or oncoming car lights at night (they almost seem to put me in a trance at times). Strobe lights are the worst. Or bright light through trees if you're driving at a high speed. It doesn't necessarily trigger a seizure but it sure messes with my eyes and again almost puts me into a trance like state. Weird. Talk about giving me a headache.