at the end of your rope
US /æt ðə ɛnd əv jʊər roʊp/
UK /æt ðə ɛnd əv jʊər roʊp/

1.
at the limit of your patience, endurance, or resources; desperate
:
•
After weeks of trying to fix the problem, I'm really at the end of my rope.
•
The constant demands from her boss left her feeling at the end of her rope.