Exiting the subway, ray is suddenly filled with escalating feelings that he cannot breathe, that he may die, and that something bad is going to happen to him. chances are good that ray is suffering from a:

Anxiety or Panic attack. (Accordingly to Psych-101-chapter-13-flash-cards).

Explanation:

Many people suffer this disorder which if it is not treated properly can be even pathological and generate various problems in the personality, up to the point of leading to social issues that  could create injures or affect other people (like family or friends) besides the patient.

i think its toxic gasses but i could be wrong

imperial crisis leads to civil war.

roman forces withdraw from britain as goths attack rome.

odoacer topples romulus augustus

huns attack the empire and drive german peoples ahead of them.