My sister who is 51 years old and had been experiencing black out spells for about 10 yrs. Recently had a Hysterectomy and it stopped. Yesterday she had an episode and her systolic and diastolic got so low they could not get a pulse , sh, No mire was out for about a minute,hen she came out of it she was sweating profusely and trembling, all lab were was excellent, Ekg and chest xray were fine