I'm at the end of my tether.

Meaning

I'm extremely stressed and frustrated, about to lose control.

Examples

• John: 'I've been dealing with this problem for weeks, and I'm just about to give up.'<br>
• Alice: 'I understand. I'm at the end of my tether too with this project.'
• John: 'I know what you mean, sometimes I feel I'm at the end of my tether with mine.'
• Alice: 'The children have been driving me crazy all day!' <br>