Assalamualaikum, yes work is tiring. 1st day is extra tiring, not used to it yet.
Humans will adapt.
But still must push on. Sigh, work almost made me tired out of myself.
The days that you have for resting (leave like a week or more) will make you find yourself, at that point of time you are stress-free, you tend to feel your soul better thus doing what you like and eventually you feel better=happier. Or just get your mind of off work (vacation) instantly make you feel better.
What's climax is to be stress-free at work. Or at least try to minimize the standard you need to provide or attain. To achieve this, I think you need a higher order. Need to think that besides all this work that you are doing, there is a bigger thing, of course that bigger thing is God. Think that no matter what happens at work (worst is get fired or charged), You have God to turn to.
You will still and always have Him. Sometimes I feel like I want to...
Nothing is as important, remember that afterlife is forever, now is temporary (Most driving factor to relax lah)
So, relax lah. Work is not entirely life and Life is not entirely work.
Relax ok, take care. Assalamualaikum.