paris syndrome

Paris syndrome...is a transient psychological disorder exhibited by some individuals visiting or vacationing in Paris or elsewhere in Western Europe. It is characterized by a number of psychiatric symptoms such as acute delusional states, hallucinations, feelings of persecution, derealization, depersonalization, anxiety, and also psychosomatic manifestations such as dizziness, tachycardia, sweating, and others...

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There is a 24-hour help line run by the Japanese embassy to help Japanese tourists suffering from this condition.