A Nervous Breakdown is a term which describes a relatively short period of extreme negative feelings, thoughts and symptoms.
The often last a few days to a week and then the feelings thoughts and symptoms subside at least little. It is common to have suicidal ideation, feelings of want to or acts of self harm and the lack of willingness and energy to do even the simplest of tasks.
These symptoms often don’t last after the breakdown and it is uncommon that you would be allowed into hospital after suffering one.
Read more on nopanic.org.uk