Brianna suffers from episodes of an immoderate fear of danger. When this happens, she suffers from heart palpitations, shortness of breath, and nausea. She remains in this condition for around 10 minutes at a time but sometimes it continues for an hour or more. Brianna is most likely to be suffering from ________.

A panic attack is a psychological disorder that is characterized by intense fear with severe physical reaction even if there is not present any genuine reason for fear or apparent reason for the fear. It seems very dangerous because this person feels that he may have a heart attack or maybe dying due to a heart attack. People have maybe one or two panic attacks in their lifetime and the danger of the situation goes out.

Symptoms:

Fear of loss of control
Feel near to die
Palpitation
Increased heart rate
Chest pain
Headache
Dizziness
numbness

Thus in the above statement, Brianna suffers from episodes of a panic attack and she stays in this condition last 10 minutes.