We cant diagnose our patient with one or two symptoms. We need to knoe the total present symptoms, with past hostory etc.
It seems he has some obsessive thoughts ,angry at trifles, Suicidal thoughts. It all indicates towards Personality disorder /Mood disorder.
Next Steps
Consult psychiatrist and take proper treatment and follow up treatment.
Also consult Psychologist and take proper counselling and psychotherapy and learn how to deal such worse conditions in life.,learn how to control our over emotional states etc.