quote

Quentin is a distraught Alice in a haunted wonderland.

I think that Quentin is trying to find himself and is trying to find his own identity, and is distraught because of that. He is distraught because he's trying to find himself while trying to save Caddy's reputation all at the same time. Quentin feels like an outcast because he is physically away from his family at Harvard and it is there I think that could also be considered his "haunted wonderland" because he commits suicide at Harvard. It is at Harvard where Quentin begins to fall apart rather quickly through his section.