Even before when I wasn't sober, and I had a stressful day at work (or was due a stressful day and I was on my way in), I'd say a quote to myself from a Vietnam film called "Hamburger Hill". The quote was very easy to remember, "It don't mean nothing man, not a thing!"
Still makes me smile when I say it, and I get an instant relief. Work is work, like the rest of life. None of it will matter after a short while, you'll be on to the next challenge and then the next and so on. Just enjoy it, it's not important. It's all just a game. Some play it better than others, some cheat.
It don't mean nothing man, not a thing.