Derealization is a state that can be precipitated by substance use, but in order to be diagnosed with the mental illness depersonalization/derealization disorder a person must meet certain criteria as set by the Diagnostic and Statistical Manual of Mental Disorders, including:
- Persistent and recurrent episodes of feeling detached from the external world, from objects and other people
- Being aware that the experience of feeling detached is not real; retaining a connection to reality
- Episodes of derealization that are not solely caused by a different mental illness and that are not directly triggered by substance use
- Significant distress or dysfunction in one or more areas of life as a result of the derealization feelings
Someone who is experiencing derealization may have episodes that occur out of nowhere or that set in gradually. Likewise, the episodes may end suddenly or fade out more gradually. The duration can range from minutes to hours or even longer. Derealization, whether caused by drug use or as part of depersonalization/derealization disorder, can cause a number of sensations or feelings and symptoms, including:
- Feeling as if objects and other people are not real
- Sensing a fog, wall, or veil separates an individual from the rest of the world
- Feeling as if the outside world is lifeless, colorless, or drab
- Distortions of objects or people, making them seem larger or smaller or blurry around the edges
- Distortions in the sense of time or in sounds
- Distress, depression, or anxiety
- Feeling certain that it is one’s own feelings that are skewed, not objects or other people
Addiction, or substance use disorder, is a very serious mental illness that needs to be diagnosed and treated. It is characterized by out-of-control use of a substance, like an illicit drug or alcohol. To be diagnosed an individual must have multiple symptoms:
- Taking more of a substance than intended and wanting to stop using but failing
- Spending a lot of time on substance use or recovering from use and even giving up other activities in order to use
- Failing at responsibilities and having problems in relationships related to substance use
- Craving a substance
- Continuing to use substances even in dangerous situations or when it harms physical or mental health
- Developing a tolerance to a substance
- Going through withdrawal when not using
There are many other potential signs of addiction and substance use, as well as complications. In some cases these may include experiences of derealization. One of the most serious complications of addiction is overdose. Signs of extreme intoxication, loss of consciousness, slowed breathing, and vomiting should be taken seriously and treated as a medical emergency. Overdoses can be fatal.