How do I cope with a job that never lets my mind rest?

You are good at what you do. You can price almost anything. And still the work never switches off, so your mind stays lit even when your body is still. That kind of tiredness is real, and pretending it is not will only wear you down further. A mind that never rests is not a stronger mind. It is one being asked to do the impossible. Rest is not a reward you earn after the work is done; it is part of doing the work well over a long life. The market will still be there tomorrow whether or not you carried it home tonight. Choose one hard edge in your day, a time after which you do not check, do not calculate, do not replay. Guard it like it matters, because it does. Your mind will not rest unless you give it a door to walk through.