Gurm Mine was even more clear-cut than that. I had taken holidays at the end of December 2011 to build myself a gaming PC that totaled $3,300 of shiny new parts. I was very excited to play all the latest PC games out at that time at full graphics quality settings. My monitor was a Samsung SyncMaster S24A850DW 24" LED PLS, and it displayed an absolutely gorgeous image.
However, immediately upon using it, my eyes ached as if I was looking into a flashlight. I also had the feelings of sea sickness. It seemed to be ravaging my neurological system for some reason. At first I thought it was the games I was playing like Battlefield 3 and maybe the high FPS and the realistic graphics that was making my brain think it was real or something. However, after taking a long break until the symptoms subsided, even reading articles online produced the same response. Since this was a period of time that I was off work and having fun, there was no stress to be had when these symptoms first started. It was triggered by looking at the monitor.
Despite all that money I spent and the excitement of having a new computer, I shelved it because of the way it made me feel and went back to my old computer, where I didn't have any problems (on another Samsung LCD that was a CCFL backlit). About a year later I decided to try that nasty new PC out again, but I changed the formula by throwing my old monitor on. Problem fixed! I've been using that new PC finally ever since, but I at least upgraded my monitor to the Dell U2410 I'm still using to this day, because that's the monitor I've been using at work since mid-2011 without issues.
However, I haven't suffered any TBIs before, nor had any issues with seizures or anything of the sort. My issues with frequent tension headaches go back to March 2006. I experimented with some pharmaceuticals like amitriptyline and venlafaxine back in 2007 to see if they would help the headaches, but didn't notice any real difference so I successfully weaned off of them. Hopefully they didn't do anything long-term, but you never know.
My sensitivity to LEDs isn't linked to these headaches though, because the "LED headache" (as I call it) feels way different than a tension headache. It's deep in the head, sort of behind the eyes, and comes minutes after looking at an LED-backlit computer monitor. Total avoidance of these displays is the only "cure" I have found to date.