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If you can afford it, it's not a bad idea to take a vacation.

And if you keep seeing unrealistic deadlines at work, just go somewhere else. It's extremely hard to get someone to treat you the right way.

It's much easier to find someone else, and this can go for a manager, friends, partners, etc.

Is this the only job where you have this issue, maybe taking a lower paid role where you're no longer a lead would be better. The idea of being a manager of any sort horrifies me to no end.