See the similarity of your description to this one. https://ledstrain.org/d/1603-sea-salt-externally-applied-the-best-thing-ive-found-so-far
Note of course that we may not all have the same problem (and we certainly don't all have the same symptoms). I don't get headaches or eye pain or any of that. I turn into a "zombie," is the best way I can describe it: it's as if my brain turns to putty, I start feeling disoriented, my thinking becomes slower and clumsy, I start making mistakes when I type, I start feeling disconnected with the world around me, I can no longer interact smoothly with other people, and my joy and richness of perception of the world is sapped. It is also worth mentioning that I can watch videos on any screen indefinitely with no ill effect. If I am looking at anything else on the screen -- particularly reading text -- I get the symptoms.