Yesterday I had pre syncope.. Gotup from Sleep at 4 am n went to urinate. After I was done felt very uneasy..ears rang loudly, face cold, tightness in chest n stomach.. I felt I was unable to walk n vision blurry.. rushed outside room then sudden cramp in stomach n went to washroom to pass stools. After that I got normal n went to sleep.. Ecg done today is normal... No personal/family history of cardiac event.... I am on antidepressant sizodon since 10 days for ocd Today whole day I felt tired n dizzy n on walking drowsy.. can u tell me what cud be the reason? Is this cardiac related??