Did you suddenly feel depressed for a moment?

Yes, sometimes I suddenly feel depressed, especially tired, and feel that living is meaningless and hopeless. Sometimes I feel like an old man who has seen the world, who doesn't care about anything and looks down. Sometimes I suddenly have no motivation and don't want to move. I don't know why, my brain suddenly becomes empty and I don't know what I'm thinking. Like a clockwork robot, I can't turn around. There is a moment in life when you suddenly feel depressed, even if nothing happens.