A friend suddenly went crazy. At first, he talked to himself, denied people, was unconscious and committed suicide.

This is a mental illness, mild depression. If you have no place to vent your anxiety for too long, you will talk to yourself unconsciously. You don't have to be afraid of medical treatment. You should see a psychiatrist in time. China people need to change their ideas. Modern people live under great pressure. It's not a shame to get mental illness. Even Cui Yongyuan has the courage to admit that he has depression. I admire his courage.