You know I'm in on this one...from what I've learned, it can be a side effect of a spirit using energy around you or using your energy. For me, I don't know. I get them almost every other day. Thought it was a food issue (MSG so i cut it out of my diet)but i still get them. The only symptom i don't get that 's associated with migraines is nausea...sensitivity to light, BIG TIME...and caffeine or chocolate doesn't effect me so what does that leave for me...paranormal? Subconscious stress I have a swelling reaction to, i know, weird but other then that, I have no idea why I get them. Good luck with this one lol.