I have not read that book, but I doubt it. Mine is a fantasy novel where the main character is my main hallucination. I do not know if I started the book first, or if the hallucination came first, but basically, there is this whole person that haunted me for years: an angry, violent version of myself who wants revenge. In the book he goes for it, but I explore the struggle between the person and the hallucination and how he struggles to determine what’s real and what’s not.