at your wits' end
Meaning: If you're at your wits' end, you're upset and frustrated because you've tried everything you can think of to solve a problem, and nothing has worked.
- I'm at my wits' end! I've been trying to solve a problem with some software all morning and I still haven't got it to work!
- Kelvin says he's been trying to get tickets for the game all day, but he's at his wits' end. Nobody's got any left.
If someone's at their wits' end, they probably feel