Dear management,

If you tell me, "You can have a day off with your accumulated vacation leave if you work 12-hour shifts for the rest of the week," when I have specifically denoted that the reason for the day off is due to impending burnout caused by copious stress, what you are going to get is me being hospitalized for a grade-S panic attack and advised to take a one-month medical leave of absence.

That is not me being threatening, it is a statement of fact. I am not burning my meager vacation leave on a destress if you're going to be undoing every gain I might make, moments later. I am not going to be ignoring my physical and mental health for the sake of a number going up. If my job is so important that you cannot spare me for a single day in order for me to actually recover from having to deal with people screaming at me because their orders didn't get to them in time, because guess what, I can't destress over a single day, then you may soon come to appreciate what it's like to operate without me for a far longer period.