GlossaryObsession: An anxiety disorder that is commonly characterized by the person's obsessive need to perform a particular task or set of tasks repeatedly. Psychotherapy: It is the process of treating psychological or psychiatric problems through counseling.Serotonin: A neurotransmitter in the brain that is involved in the processes of sleep and memory, a well as other neurological functions. Published on Aug 17, 2015Last Updated on Aug 18, 2015