I believe the anesthesia was another straw in a whole bag of straws. After that, new industrial carpet at work caused anxiety and concentration problems bad enough that it affected my work. Then I sort of recovered from that. Then a change in jobs (at the same place) and a move to a newly remodeled building is what finally did me in. A few years prior to the anesthesia, I worked with industrial solvents for a couple of years. Add in some mercury fillings and poor methylation cycle genetics, and voila.