Obsessive Compulsive Disorder

Most people are familiar with obsessive compulsive disorder as is popularized in many TV shows and movies. My favorite is Monk, a TV show about Adrian Monk, an investigator who works with the San Francisco police department. Due to Monk's severe OCD (along with other disorders), he was forced into retirement as a detective with the San Francisco PD. The show is unflinching about the negative effects of Monk's disorder, but of course it introduces humor into his predicament. 

According to the DSM-5, obsessions are "recurrent and persistent thoughts, urges, or images" that are intrusive and cause distress. The individual attempts to ignore the obsessions, but is generally unable to. Compulsions are repetitive behaviors - such as hand washing, checking, praying, counting, or word repetition - that the individual feels compelled to perform in order to reduce anxiety and distress.

Panic Disorder

Fear is an emotion that elicits the "fight-or-flight" response of the autonomic nervous system. It is an immediate (uncontrollable) response to a direct danger - such as a rattlesnake, a gun pointed at your head, or a fast car driving right at you. Fear is generally a helpful response that allows you to protect or remove yourself from the imminent peril. 

Sometimes the fear response can occur in the absence of any obvious stimulus - this can lead to a panic attack. Panic attacks are terrifying physiological and psychological events in which your autonomic nervous system ramps you up for fight-or-flight. Often, the person becomes terrified that they are dying - usually of a heart attack. Like intense fear, the heart starts pounding, adrenaline flows, breathing races. Sometimes the victim will run from the room - perhaps to a hospital or perhaps with no direction at all - to escape the unseen threat.