There aren't any specific signs or symptoms it's different for every one.
Symptoms may differ for describing a nervous breakdown, but one can look for the following behaviors as possible symptoms that might precipitate a psychotic episode:
• Disinterest in work or family life
• Disinterest in social life or alienation from previously close friends and family
• Sleep disruption or much longer periods of sleep
• Significant changes in appetite, such as eating too little or too much
• Paranoid thoughts, such as the thought people are trying to harm you
• Thoughts of grandeur or invincibility
• Feelings of persistent anxiety or panic attacks
• Hearing voices
• Seeing people who are not there
• Thoughts of dying or wish to die
• Exhibiting strong or violent anger
• having flashbacks to aaa prior traumatic event
• Increasing dependence on alcohol or drugs