nervous breakdown

The term "nervous breakdown" is sometimes used to describe a stressful situation in which someone becomes temporarily unable to function normally in day-to-day life. It's commonly understood to occur when life's demands become physically and emotionally overwhelming. The term was frequently used in the past to cover a variety of mental disorders, but it's used less often today.

Nervous breakdown isn't a medical term, however, nor does it indicate a specific mental illness. But that doesn't mean it's a normal or a healthy response to stress