Chronic depersonalization refers to depersonalization disorder which is classified by the DSM-IV as a dissociative disorder. Derealization is a similar term to depersonalization, and the two are often used interchangeably.However, more specifically, derealization is the feeling that nothing is real, while depersonalization is the feeling that one is literally detached from one's body or world.owever, more specifically, derealization is the feeling that nothing is real, while depersonalization is the feeling that one is literally detached from one's body or world.