Π/Headscratchers

Kind of minor, but what was up with Max and his neighbor towards the end of the movie? First he's hallucinating because of his headache, then it cuts to her holding him. But then, she's gone. Was he just hallucinating her being there, or was her entire presence in his life an illusion?
- Depends on how you interpret it, much like everything else in this movie. The neighbor being illusory is of course a valid interpretation. Assuming the neighbor is real, the last cut of her holding him is probably symbolic hallucination in the same vein as him trepanning himself.