Of cource I can only reply about my own experience. I used to have a stressful, very fast paced job as a telco service rep, and later as a project manager. I hated both jobs, but did them very well. Both jobs required high energy, fast thinking, multi-tasking, etc. There is no way I could do that hard of work again. Now if I have more than one complex task going on I get confused, forgetful, irritable, etc. You know what? I don't care all that much. I don't have to do it for the money and I don't have to prove anything to myself. I visited eastern Africa a few months ago. Two things locals love to say to visitors is "poley poley" and "akuna matata" which mean "slow down" and "don't worry, be happy." They are too right. Our culture is captivated with excess of all kinds. It is not only damaging to the ecosystem, but to our personal well being, too. Maybe you will get your fire burning hot again someday, maybe not. Is it really something you need in life? Is it worth the cost?