Since he also sings something about "lost marbles", I would say the lyrics are no metaphor but about disassociation:
He literally does not recognize the face in the mirror, he is annoyed by the stranger in the bathroom, he switches into third person at one point ("All he ever wanted..."), and he literally does not know which day it is. But he takes it with a wink ("But he was sporting all my clothes, I gotta say pretty pimpin'").
Since he also sings something about "lost marbles", I would say the lyrics are no metaphor but about disassociation: He literally does not recognize the face in the mirror, he is annoyed by the stranger in the bathroom, he switches into third person at one point ("All he ever wanted..."), and he literally does not know which day it is. But he takes it with a wink ("But he was sporting all my clothes, I gotta say pretty pimpin'").