Oddly, I've also cured a migraine by whacking myself on the head...although I think I hit my head much harder on a much more pointy thing that time. That was a corner of a ceiling-mounted TV monitor on a bus in Mexico, when I was getting back into my seat after seeing pyramids at Tulum. I had a raging migraine due to the heat and humidity, and that went away, to be replaced by the ouchiness of the immediate head injury. Which was preferable, to be honest, although I do not recommend making a habit of trying to cure migraines by whacking yourself on the head.
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