I think he was a borderline psychopath. He focused on his madness which probably brought him to hallucinate. But it's been so long since I've watched it, and I wasn't very interested in the story at the time. I would be able to boil it up easily if I had just watched it again, but have no plans yet to re-watch it again.

I'm not allowed to watch movies that portray mental illness, as it affects me in ways I'm yet not able to say.