Escape from Self
In any addiction, the content - whether it be "ingestive addiction" (e.g. drugs, food) or "activity addiction" (e.g. sex, work, buying, gambling) - is an attempt to fight or avoid loneliness. It's a quest for intimacy in relationship. The workaholic with his work, the alcoholic with his booze, the adulterer with his partner, are all having a love affair!
Because fear of exposure of self to self lies at the heart of most emotional illnesses, escape from self is necessary. The escape of self is facilitated by mood-altering addictions. It seems obvious that many mental disorders classified in the DSM psychiatric manual are related to escape from self. These include clinical depression, schizoid phenomena, and personality disorders. My own belief is that the false self or escape from self is a unifying concept amid the maze of clinical and psychotherapeutic definitions and distinctions.