Honestly, I know what stress is like. I went years, years I tell ya, sweating the week out and making payroll for 30 people. The one lesson I learned is that you have to get enough sleep, and you have to exercise. And you have to find time for fun. Work hard, play hard. There are no other shortcuts. At least for me.
One year I had a particularly difficult client that would call me off hours and throw changes at me the night before a crane would show up, and the like. I started skipping meals, working til 2 am, getting 4 hours or less of sleep. I was miserable. I was losing weight rapidly, but for bad reasons. I ended up sick as a dog. Someone in an earlier reply said change jobs. I basically made a change and went after a different market segment. Still doing essentially the same thing, but I have normal hours, travel a couple times a month, lots of time for the family. Best move I ever made.