While it does not sound like DID to me.... it does sound like a form of mental illness where one creates a make believe world as a means to escape the pain in their real life or past - there is a name for it, but I cannot remember it at the moment.

Have you ever watched "Never Was" - if not I would recommend you take a trip to the video store soon.... this 2005 film tells of the disorder I spoke about with every ounce of compassion and dignity for the wounded person that suffers.