If I may be permitted a pun: that was all in your head.
I went to the doc a couple of days into it because I've never had a migraine that strong.
He said most likely the iris close extremely quickly to deal with the intense blast of light, and this probably pulled the muscles in the area and caused the headaches.
3 years later of getting a check up every 6 months, still have 20/20 vision thank God.