Some one who is never sorry, or has no regrets for doing something wrong has serious problems. All of us feel depressed at times. When depression interferes with your normal functions for more than six months it is considered a major depression. I person stays in bed and does not get up and go to work. There is trouble trying to fall asleep, and there is trouble with waking up early and not being able to get back to sleep.
Major stress can cause one to have nightmares.
Anxiety or depression can cause a loss of appetite. Someone very depressed may have thoughts of suicide. Take every threat of suicide seriously. See how serious the threat is. Stay on the phone until they unload the gun or turn off the gas.