Recently, my 17 year old daughter has had two episodes which remain unexplained. The first time, she was unresponsive for about 2 hours, rapid pulse, pupil dialation, lip smacking, gutteral laughing, slight tremors of the upper body, no memory of the incident. The second=symptoms included blurred vision, rapid pulse, trouble breathing, but she remembers this event. All tests (CAT scan, blood work, 2 EEG's) have been normal. Allergy tests have only concluded an allergy to fur, grass, dust mites, and tuna fish. Can anyone shed some light on what might be going on.