In "The Raven" how does the narrator's emotional state change during the poem?

The poem
unfolds in such a way that the author or narrator progresses from mild annoyance to absolute
madness or insanity. He, at first, is rather intrigued by the bird, until he realizes that the
bird's one-word vocabulary (Nevermore) is merely a reflection of his own tortured grief. It is
the repetition of this word that drives our narrator insane by the poem's end, as he recalls and
deeply laments the loss of his one love, .