As far as my lack of satisfaction is concerned isn't really to do with the type of work I do - and rven the hours, it's the necessity ro work for the best years of your life just to survive, looking forward to the few weeks of freedom each year, and the hope that I won't starve / freeze to death...
A number of years ago I read a few books on downshifting etc. If you can do it, and live through the transition i'm sure you come out a more relaxed and happy person, but the path from a relatively high earning and consuming lifestyle to frugal living is painful one.