The Crying of Lot 49 Madness Quotes

How we cite our quotes: (Chapter.Paragraph)

Quote #10

The toothaches got worse, she dreamed of disembodied voices from whose malignance there was no appeal, the soft dusk of mirrors out of which something was about to walk, and empty rooms that waited for her. Your gynecologist has no test for what she was pregnant with. (6.127)

As in the beginning of the novel, we learn that Oedipa hallucinates. How does her unhealthy mental state make it difficult for the narrator to navigate the novel? Is there any way to tell what is real and what is not?