Buy Xanax Online (Alprazolam) Benzodiazepine A panic attack is a sudden episode of intense and sudden fear which appears when actually there is no danger as such. In some cases you may get confused between heart attack and panic attack. A person might undergo only one panic attack or he might experience multiple panic attacks throughout the life. If it is left untreated it may lead to development of fear of experiencing them again, it can also lead to avoidance of places and peoples. This is ...