Slaughterhouse-five: Listen to the Barbara (9)

Event though i have a strong opinion of Valencia's ridiculously unfortunate death, I decided to discuss something far more important.
When Billy walk into the bookstore and sees Kilgore Trout's book, it really made me wonder where it was all going, because even if we suppose Billy knew the book and all is delusions were based on a mixture of a handful of events, then we could say Billy's daughter Barbara was right when she said the Tralfamadorian kidnap on her wedding was caused by Trout.
My educated guess clams that Billy lost his mind during war and has the illusion that he became "unstuck in time" because his memories have all become tangled with one another and broken into unrecognizable fragments. I suppose Billy looks like an ordinary crazy man on the outside, and that outside in which we're in influences him and influences his corrupted thoughts. I think Billy can just look at a picture of a strange woman and think he knows and he'll probably "remember" where he met her and "know" what she's like.
I can't trust anything i've read up until now because clearly Billy is insane and untrustworthy, I just wish i knew what was going on!