Symptoms of severe anxiety and panic associated with social anxiety disorder include:

• Fast heart rate and fast breathing.
• Sweating.
• Nausea.
• Trembling and feeling weak in the knees.
• Being unable to move or run away.

Symptoms of panic include:

• Feelings of terror or hopelessness.
• Chest tightness or chest pain.
• Severe difficulty breathing with a fear of choking.
• Hot flashes or chills.
• A sense of unreality (like being in a dream).
• Fear of losing control or going crazy.
• Fear of dying.

See the topic Panic Attacks and Panic Disorder for more information on symptoms of severe anxiety and panic.