at wits' end

at (one's) wits' end

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 already at my wits' end, so if this train gets delayed too, I'm going to scream.
See also: end

at (one's) wits' end

At the limit of one's mental resources; utterly at a loss.
See also: end
References in periodicals archive ?
Now the residents are at wits' end, complaining that the trucks also fill the air with fumes, which aggravate the respiratory ailments of many of the park's residents, mainly senior citizens.