One of the mistakes was working how we think entrepreneurs are 'supposed' to work. I counted one time (stopped after that since it was depressing) that I worked 8 straight months, zero days off, and averaged 16 hours a day. At the time, I was proud of that, wore it like a badge of honor.
However, it took a massive toll on my health. I went to lots of junk food - i was never home to eat, I gained literally over 100 pounds (over a decade), had sleep problems, ulcers, asthma, and more.
I have long since learned my lesson, lost all of that weight (my doctor wants me to go into that niche..), changed my work habits, even changed how I design and build companies.
The point is this. Your success is not worth your health. Don't end up sacrificing your own health on your path to success.
You owe it to yourself to give you good health! And, your success will be greater in the long run, when you are healthy.