If in a very room or building, Claustrophobia sufferers may constantly be checking for doorways and exits or standing near exits even during large rooms, and feeling fear when doors are closed. Smalls spaces like cars, planes and lifts ca also bring anxious feelings. In some cases being in these situations can bring on panic disorder, in extreme cases just going to a closed door may cause a Panic Attack. Now, in review, derealization and depersonalization frequently accompany panic attacks and anxiety. In general terms, derealization is a frightening sense of detachment in one?s external environment, and depersonalization can be an quite as frightening a feeling of detachment from self. Both might be absolutely crippling and take you on the turnstiles of your respective perception of insanity. Flickr:Giorgos Gotsis: