be at (one's) wits' end
To be in a state of distress because one has no more patience or mental stamina, often after having dealt with some kind of problem or difficult situation. The baby's been crying for hours, and I'm at my wits' end! I'm at my wits' end, so if this train gets delayed too, I'm going to scream. Mrs. Smith must have been at her wits' end because she screamed at Tommy for disrupting class.
Farlex Dictionary of Idioms. © 2024 Farlex, Inc, all rights reserved.