A crisis or panic attack starts suddenly and often reaches its peak within 10 to 20 minutes. Some symptoms may continue for one hour or more. A panic attack can be confused with one heart. http://www.cureinnature.com/topics/general-health/

Panic attacks may include anxiety here to be in a situation where escape might be difficult (like being in a crowd or traveling in a car or bus).
A person with panic disorder often lives in fear of another attack and may feel fear of being alone or far from medical help.