Your friend has some fears of places or situations where a panic attack may happen and from which it would be difficult to escape.Some of the people experience panic while they are sleeping.But everyone who suffer from Agoraphobia avoid being out alone, going to supermarkets, travelling in trains and planes, being at heights, in elevators or tunnels or crossing open fields.
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It is not meant to substitute for medical advice provided by your physician or other medical professional.
If you have or suspect that you have a medical problem, promptly contact your physician or health care provider.