WHOA, This article says he suffered from Lymes disease too. That's kinda significant, because it causes nerve inflammation (Pain like from his back issues) and neurological disorders. People have been misdiagnosed with a wide variety of mental illnesses that have turned out to be Lymes Disease:
https://www.discovermagazine.com/health/the-blurred-line-between-lyme-disease-and-mental-illness