Thanks for that, I'll check it out some time. He is a very interesting character and I've been meaning to read several of his books but I haven't got round to it yet, as well as books about him, and I saw a clip of some press conference-type thing that he gave once in which he talked about his weird experience of slipping into some parallel life or something. I'd like to see the rest of that press conference if it's online somewhere.
By all accounts he took more than his fair share of drugs, but that doesn't necessarily mean that the weirdness he experienced was not real. I suspect it has more to do with his prolific creativity and relentless use of his imagination.
Anyway, I did get round to reading VALIS, and I would recommend that to anyone who is interested in reading any Philip K. Dick.
Also, you might be interested in this article about Philip K. Dick by another very interesting writer, Paul Levy - https://www.awakeninthedream.com/articles/enlightened-madness-of-philip-k-dick
RE: Review | Ubik by Philip K. Dick