Delirious is personal insanity. When it feels like the universe is collapsing in on itself and nothing matters anymore but the right now. It's the point where thought and action are lost to a blur, and existence is simply the realm of the sensory, the visceral, flashes of memory that meld with the illusions of the moment. It's a state of nothingness. When personality is non-existent, and the mind tries to account for suffering in its most logical terms - and fails miserably.