Hello.
There are no hard and fast criteria to decide if it is a nervous breakdown, which is not a clinical term. We use the term when there are extreme emotional and psychological disturbances due to various reason.
There are a number of possible manifestations of a nervous breakdown. You could have anxiety and panic attacks, disturbed sleep patterns, disturbed eating habits, easy irritability, getting angry and abusive on minimal provocation, inability to concentrate, etc.
During a nervous breakdown, your productivity reduces drastically.
These are some of the symptoms you can experience. I would suggest you visit a counselor or a psychiatrist for help.
Regards
This post is for the purpose of providing medical information and is not a substitute for a face-to-face consultation with a doctor. This post is neither intended to give or rule out a diagnosis, nor to create a doctor-patient relationship.