I came across this new sensitivity book lately, "Girl in the Dark", by Anna Lyndsey:
http://www.amazon.co.uk/Girl-Dark-Anna-Lyndsey/dp/1408858266/ref=sr_1_1?ie=UTF8&qid=1426690405&sr=8-1&keywords=girl+in+the+darkThe lady in the book starts off with electrosenstivity to computer screens and other electronics. Then she develops a sensitivity to natural light, hence the title of the book. From flicking through it, it seems mostly about her dealings with family members, and the people she encounters in trying to find help; and how they react to her sensitivity. I've heard of a couple of other people before who start off with a sensitivity to electromagnetic fields/dirty electricity, and then developed a sensitivity to natural light. Which is obviously a disastrous scenario.
As an aside, I've seen it mentioned before on this forum that it is the low frequency EMFs that people react to. But how does someone then become sensitive to natural light from the sun, it being in the middle of the Electromagnetic spectrum? some might classify it as a separate type of sensitivity to esens, but it is still electromagnetic sensitivity.