What is the origin of the idiom "at one's wit's end" and when to use it?

The idiom "at one's wit's end" is used to describe a state of extreme frustration, confusion, or helplessness when someone has exhausted all their resources, ideas, or patience in dealing with a difficult situation or problem. It is often used in situations where individuals feel overwhelmed and unable to find a solution or way forward. This expression implies a feeling of being completely stuck or at a loss for what to do next. It can be used in various contexts, such as personal challenges, professional dilemmas, or even in parenting when dealing with a particularly difficult child.