depersonalisation /derealisation disorder
Depersonalisation-derealisation disorder occurs when you persistently or repeatedly have the feeling that you're observing yourself from outside your body or you have a sense that things around you aren't real, or both. Feelings of depersonalisation and derealisation can be very disturbing and may feel like you're living in a dream.
Many people have a passing experience of depersonalisation or derealisation at some point. But when these feelings keep occurring or never completely go away and interfere with your ability to function, it's considered depersonalisation-derealisation disorder. This disorder is more common in people who've had traumatic experiences. Depersonalisation-derealisation disorder can be severe and may interfere with relationships, work and other daily activities. The main treatment for depersonalisation-derealisation disorder is talk therapy (psychotherapy), although sometimes medications also are used.
Persistent and recurrent episodes of depersonalisation or derealisation or both cause distress and problems functioning at work or school or in other important areas of your life. During these episodes, you are aware that your sense of detachment is only a feeling and not reality. The experience and feelings of the disorder can be difficult to describe. Worry about "going crazy" can cause you to become preoccupied with checking that you exist and determining what's actually real.
Symptoms usually begin in the mid- to late teens or early adulthood. Depersonalisation-derealisation disorder is rare in children and older adults.