I used to bjj in the mornings before work because my mentality was "If i've already been choked out, beat up, and tapped out then there's nothing worse that the day (or my boss) can throw at me." (ie, it's all easier from 8am on)
So one of my personal baselines for physical danger... I've had guns pointed at me a couple times on dark streets, including once by a crazy-overconfident young teen saying he was going to shoot me when I told him I didn't have a wallet (and I had to maneuver as he was saying this, to put a parked car between us, before I sprinted away and hopefully didn't get shot in the back once he could line me up). The other time, as soon as I realized what was happening, I went to an old script for handing over my wallet, suddenly very clear-headed and focused and calm, so much so that the mugger pointing a gun at me started getting nervous and shouting at me.
I was wired after both those times, but humans evolved for brief life-threatening stress like that.
Job stress is different, and can be worse for humans:
* It can be something you can neither fight nor flee.
* It can happen over a long period, which we aren't built for.
* It can threaten more than just you (your family, your colleagues, strong values).
I've had desk-job crisis situations in which the company might rest upon me pulling off something not necessarily possible, when I have to invoke calm, sharp, in-command Astronaut Mode, for days at a time. But IME that only works when you can take some command, which isn't all bad corporate situations.
If one has the perspective that the job can't be worse than what they've survived, I suspect that's great, in that it will help them avoid stress adverse impact on their health.
Unfortunately, I don't think everyone can have that perspective, and it's also not always an accurate perspective.
The fear of being fired gives them more power over you. Remove the fear and take your power back.
You walk around the office differently, you're more likely to take jobs that interest you, challenge you, and where you feel fulfilled vs the place that pays you the most.