Panic and Agoraphobia
Having a Panic Attack feels horrible. People who have them can think that they are going to have a heart attack, faint, die, do something embarrassing or go crazy. Some people are so afraid of having other Panic Attacks that they can start to avoid the places where they feel a Panic Attack is likely, where one has happened before, or avoid activities which cause similar bodily sensations.
Some people get so stuck in this pattern of avoidance they become Agoraphobic, avoiding any place which they feel would be difficult to leave or get help (eg. Shopping malls, airports, bridges, tunnels, trains). In severe cases they may struggle to even leave their own home for fear of a Panic Attack.
Psychological therapy is the best treatment to help you learn how to respond to and manage your feelings of panic and prevent further episodes.