He is showing symptoms of depression.

There is one friend of mine. From last 3 months he is being so overwhelmed. He cries when explaining something. Very small problems seem very big disaster to him. He is always disoriented. And showing disinterest in things he was enthusiastic about. He always tries to distract himself by watching movies and all.. Doesn't talk much about his feelings. And aversion to efforts. He said that he has no will and hope in living a happy life. He pushes people away whoever tries to help him. He always complains of headache and body ache.  Gained a lot of weight in 3 months.. And yesterday i saw two cuts on his forearm. I adviced him to seek a doctor but he is so hopeless that he doesn't want to feel better at all.. He said that he wish that he would die.. I don't know how to help him. He is not taking any advice and pushing me away too.. Can you please help me in getting him out of this terrible condition..