Male with symptoms mimicking hea disease with normal ECG and X-ray, the diagnosis is

A panic disorder is characterised by discrete episodes of acute anxiety. The onset is usually in the early third decade with often a chronic course.The panic attacks occur recurrently every few days. The episode is usually sudden in onset, lasts for few minutes and is characterised by very severe anxiety. (Ref: a sho textbook of psychiatry, Niraj Ahuja, 7th edition, pg no.90)