When I struggled with sharing my PA needs with colleagues and coworkers, I read You Don't Look Sick: Living Well with Invisible Chronic Illness by Joy Selak. I found her experiences similar to mine even though she's living with RA. I really connected with her experiences and really liked the advice she had to share with readers.
I've read the Dr. Pagano's book "Healing Psoriasis: The Natural Alternative" and somehow convinced the theory that he explained the cause of psoriasis, i.e. the leaky gut syndrom ( porus in the wall of small intestine) But as i didn't read any other book on psoriasis so i can't say that this is the best book.
Matt
Shamael