Listed below are informational resources for Anxiety and panic attacks, including general anxiety disorder, and related subject matter.

Wikipedia article about panic attacks:
http://en.wikipedia.org/wiki/Panic_attack

National Institute of Mental Health – When Fear Overwhelms: Panic Disorder
Find out about Panic Attacks in an easy to read booklet that explains what they are, when they start, how long they last, and what to do to get help. (2008).
http://www.nimh.nih.gov/health/publications/when-fear-overwhelms-panic-disorder/index.shtml

National Institute of Mental Health – Anxiety Disorders
A detailed booklet that looks at the symptoms, causes, and treatments of the major anxiety disorders, with valuable information on getting help and coping (2009).
http://www.nimh.nih.gov/health/publications/anxiety-disorders/index.shtml

U.S. Dept. of  Health and Human Services – Women’s Mental Health Home – Panic Disorder:
http://www.womenshealth.gov/mh/conditions/pd.cfm

Mental Health – A report of the Surgeon General
U.S. Public Health Service report that covers items such as Anxiety Disorders, Panic Attacks and Panic Disorder, Agoraphobia, Specific Phobias, Social Phobia, Generalized Anxiety Disorder, Obsessive-Compulsive Disorder, Acute and Post Traumatic Stress Disorders:
http://www.surgeongeneral.gov/library/mentalhealth/chapter4/sec2.html

Answer to Your Questions About Panic Disorder
American Psychological Association – Comprehensive information about panic disorder including panic attacks and treatment:
http://www.apa.org/topics/anxietyqanda.html

American Psychiatric Association – Healthy Minds. Healthy Lives.
Information about panic disorder including the following topics:
Unchecked Panic: A “Triple A” Threat; Incidence and Frequency;  Treatment
http://www.healthyminds.org/Main-Topic/Panic-Disorder.aspx