The idea is not far from the stoic ones - try your best and stop worrying. It's like an idea from this classic debate on TDD [0]: Unit tests make you confident. You write it, you forget it. It makes you sleep at night.
In my first few years of my career, I was constantly and unconsciously thinking about the code, the business requirement, the team, even outside the working hours. That stressed and drained me a lot. In the end I realized I shouldn't have done that. If I am to worry about those things, I just book myself a calendar and go over those things within the time-box. If I need more time, I book another time block for the next day - as simple as that.
Now write that "unit test", forget it, and sleep well at night.
If you really need to worry about them, you should have a "quarterly/monthly worrying day" to reflect about your life, your career, strategies and all that. Outside that day, you just live your happy life.