If you have a debilitating fear of being seen negatively by others and humiliated in public, you may have social anxiety disorder, also known as social phobia. Social anxiety disorder can be thought of as extreme shyness. In severe cases, social situations are avoided altogether. Performance anxiety (better known as stage fright) is the most common type of social phobia.
Although how long a panic attack lasts can vary greatly, its duration is typically more than 10 minutes. A panic is one of the most distressing conditions that a person can endure, and its symptoms can closely mimic those of a heart attack. Typically, most people who have one panic attack will have others, and when someone has repeated attacks with no other apparent physical or emotional cause and it negatively changes their behavior due to the attacks or feels severe anxiety about having another attack, he or she is said to have panic disorder. A number of other emotional problems can have panic attacks as a symptom. Some of these illnesses include posttraumatic stress disorder (PTSD), obsessive-compulsive disorder, schizophrenia, and intoxication or withdrawal from alcohol and certain other drugs of abuse.
Many neurotransmitters are affected when the body is under the increased stress and anxiety that accompany a panic attack. Some include serotonin, GABA (gamma-aminobutyric acid), dopamine, norepinephrine and glutamate. More research into how these neurotransmitters interact with one another during a panic attack is needed to make any solid conclusions, however.

People with generalized anxiety disorder (GAD) display excessive anxiety or worry, most days for at least 6 months, about a number of things such as personal health, work, social interactions, and everyday routine life circumstances. The fear and anxiety can cause significant problems in areas of their life, such as social interactions, school, and work.