When he is exiting the subway, Ray is suddenly filled with escalating feelings. He feels that he cannot breathe, that something bad is going to happen to him, and that he might die. What is Ray MOST likely experiencing

Panic attack.

Explanation:

A panic attack can be defined as sudden episodes of intense fear that can lead to several physical response reactions when actually there is no real or apparent cause.

It can be very frightening to the people. In this case one feels that he is loosing control over things and even dying because of the fear of things being going around in his mind.

Symptoms can be:

Fear, loss of control, chills, nausea, abdominal cramping, chest pain,  chills et cetera.