Dissociative fugue

[Michiko]

where you wake up and you are someone else and then some time later you come back to yourself. [The thing is] you can demand people [on acid] to [dissociate]! and they think they do, but really they dont because part of a dissociative fugue is that it cant be drug-induced.

[Jessica]

In dissociative fugue, people lose some or all memories of their past, and they usually disappear from their usual environments, leaving their family and job. (Fugue comes from the Latin words for flight and to flee.)
(See also Overview of Dissociative Disorders and Dissociative Amnesia.)
Dissociative fugue is a rare form of dissociative amnesia.
A dissociative fugue may last from hours to months, occasionally longer. If the fugue is brief, people may appear simply to have missed some work or come home late. If the fugue lasts several days or longer, people may travel far from home, form a new identity, and begin a new job, unaware of any change in their life.
Many fugues appear to represent disguised wish fulfillment or the only permissible way to escape from severe distress or embarrassment. For example, a financially distressed executive leaves a hectic life and lives as a farm hand in the country.
Thus, dissociative fugue is often mistaken for malingering (faking physical or psychologic symptoms to obtain a benefit) because both conditions can give people an excuse to avoid their responsibilities (as in an intolerable marriage), to avoid accountability for their actions, or to reduce their exposure to a known hazard, such as a battle. However, dissociative fugue, unlike malingering, occurs spontaneously and is not faked. Doctors can usually distinguish the two because malingerers typically exaggerate and dramatize their symptoms and because they have obvious financial, legal, or personal reasons (such as avoiding work) for faking memory loss.