Been there and done many of the things you described, have a family today and I still love being a founder and working very long weeks. I know not everyone is like this though.

The only unmet desire I have left to work towards is to serve others and improve everyone else's life. And building a big successful business is the best way to maximize that desire. The clearest derivatives of my work efforts are the great jobs and work created for everyone at the company and the improvement on our customers lives.