As to the headaches, I haven't experienced much, though the lightheaded sensation is familiar enough. I think it comes from using the brain in ways which it is not usually used. In this sense, the Photoreading step itself is a whole-mind experience.
Personally, I find that deep breathing before and after the process helps, as well as drinking lots of water. I go with the 8-12-10 breathing pattern, but deep breathing should be enough to do the trick.
KWLee
