Symptoms include sudden, copious sweating, very rapid heart rate, a desire to get the hell out, NOW,
fainting (or feeling like it)
and numerous other sensations which are very sharp and frightening. Sometimes, to avoid panic, people stay at home, or can drive west, but not east, etc.
As you might suspect, anxiety and panic frequently travel together; the person with PANIC has ANXIETY about when the next panic "attack" may occur, for example.