Honestly, I read this ^^^ story and think, "too bad you threw away a perfectly good career and you still aren't happy". Burn out is just life and work can be a drag regardless of what you do. You think even a professional athlete doesn't feel like the season is dragging?
I think there is this B.S. line some people try to tell young people about "doing what you love" and "work won't feel like work.". That's a bunch of crap, honestly. There is stuff that sucks about EVERY job and every career has it's rough spots. The advice I give people is to find a respectable career that allows a living wage + some play money and worry about finding fulfillment after hours. In my experience people who look for personal fulfillment in their work rarely end up finding it.
I live it everyday so it ain't crap. Is it great everyday of course not but its good most of the time. Better that anything else I have done or can think of doing and as for its a waist of time well you can position yourself to get away from the masses or be down there in the masses. An education is no guarantee of anything but I wouldn't be working in the field I am now working in f not for the education, experience, constant learning and work I am able to produce.Sorry you haven't found it in your life but I'm living it and have been for almost 3 decades.