I used to love my work and see it as a path to a virtuous happiness and sense of self-fulfillment. But working for someone else had changed all that; amidst the petty slights, status contests, and probably just far too many hours in the office working for people who don't treat me well (with no choice about when or what I work on), my work has lost all its meaning. I feel like I built up a false belief system about achievement, and it worked for 27 years, but it's now come crashing down. I know I listed some probable causes, but I'm sure it could be explained more philosphically and eloquently. I need to better understand in abstract terms - what causes meaning to erode? And what have philosophers suggested as cures for such existential crises?