I found this a bit of a trip to read actually. I did not know Jerusalem has its own type of mental illness called Jerusalem Syndrome. I better not go to Jerusalem, Just because your paranoid somebody is after you does not mean it's not true. Which would put me around Type 3 Jerusalem Syndrome.
Link to the full Wiki article. https://en.wikipedia.org/wiki/Jerusalem_syndrome
Jerusalem syndrome is a group of mental phenomena involving the presence of religiously themed obsessive ideas, delusions, or other psychosis-like experiences that are triggered by a visit to the city of Jerusalem. It is not endemic to one single religion or denomination but has affected Jews, Christians, and Muslims of many different backgrounds. It is not listed as a recognised condition in the Diagnostic and Statistical Manual of Mental Disorders or the International Classification of Diseases.
The best known, although not the most prevalent, manifestation of Jerusalem syndrome is the phenomenon whereby a person who seems previously balanced and devoid of any signs of psychopathology becomes psychotic after arriving in Jerusalem.
Type I
Jerusalem syndrome imposed on a previous psychotic illness. This refers to individuals already diagnosed as having a psychotic illness before their visit to Jerusalem. They have typically gone to the city because of the influence of religious ideas, often with a goal or mission in mind that they believe needs to be completed on arrival or during their stay. For example, an affected person may believe himself to be an important historical religious figure or may be influenced by important religious ideas or concepts (such as causing the coming of the Messiah or the second coming of Christ).
Type II
Jerusalem syndrome superimposed on and complicated by idiosyncratic ideas. This does not necessarily take the form of mental illness and may simply be a culturally anomalous obsession with the significance of Jerusalem, either as an individual, or as part of a small religious group with idiosyncratic spiritual beliefs.
Type III
Jerusalem syndrome as a discrete form, uncompounded by previous mental illness. This describes the best-known type, whereby a previously mentally balanced person becomes psychotic after arriving in Jerusalem. It can include a paranoid belief that an agency is after the individual, causing their symptoms of psychosis through poisoning and medicating.