I have a question about an English idiom?

It is used in this situation… If someone gets stress continually and finally can’t stand it anymore by last stress. So, how I can say the

It is used in this situation… If someone gets stress continually and finally can’t stand it anymore by last stress. So, how I can say the last stress or the situation which makes the person can't stand anymore.

or:It is used in this situation\u2026 If someone gets stress continually and finally can\u2019t stand it anymore by last stress. So, how I can say the last stress or the situation which makes the person can't stand anymore.

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