I'm at my wit's end.

Meaning

I'm completely overwhelmed and desperate.

Examples

• John: I've tried everything to fix this problem, and nothing is working.
• Alice: Oh no, I'm sorry to hear that. It sounds like you're really struggling. <b>I'm at my wit's end</b> too.
• John: It's so frustrating!
• Alice: Tell me about it! I feel completely <b>at my wit's end</b>.