I have a problem,WHEN I INITIATE MY SELF FROM REST TO WORKING POSITION(WHEN I UPRIGHT FROM SITTING OR LAYING POSITION,OR WHEN LIFTING SOME WEIGHT,OR WHEN I DO SOME HARD WORK) THEN SEVERAL TIMES I GET SUDDEN UNCONSSIUSNESS FOR 10-15 SECONDS ONLEY,AND BOTH EYES GET BLACKOUT,WITH TWINKINGLING SMALL LIGHT PARTICALS DURING THAT 10-15 SECOND.AFTER THAT I RECOVER MY SELF AUTOMETICALLY .DURING THAT PERIOD(10-15SECOND) SOME TIMES I FALL DOWN,SOME TIMES NOT. MY NEOUROLOGYICAL ALL REPORT IS NORMAL. CT SCAN-NORMAL BLOOD CARTISOL LEVEL-NORMAL(7.98) HUTT TEST-NEGATIVE. ECG EEG-NORMAL