Mistaken

What a brilliant title: "The Man Who Mistook His Life For An Organiser" (cf. Oliver Sacks ' The Man Who Mistook His Wife for a Hat).

The Man Who Mistook His Life for an Organiser, By Mike Harris

Nigel Edge's electronic mobile-cum-organiser was the symbol of his tidy humdrum life. Meticulously separate windows for his wife, children, aged parents, hobbies and work. A place and a time for every person and appointment. But when the organiser starts to malfunction, Nigel's worlds start to collide, with darkly comic results.