You don't have to visit the Serengeti in Africa to understand what a panic attack feels like, but it is a good visual of what is going on inside of you when you do.
Consider the Antelope. They are eating with head down, grazing in their favorite place among friends or family. Suddenly, something perks their attention. The following is a short summary of what happens next: Antelope graze, lion attacks, Antelope run, Lion stops, Antelope graze.