Hi friend, Welcome to Health Care Magic Problem of the heart seems less likely. Postural hypotension is a good possibility. Occasionally other causes of delay or reduced blood supply to the brain – like neck vessels, spondylosis, venous pooling in legs and so on – may be responsible. Neurological evaluation and investigation is more likely to help Because of family history, it is wise to get yourselves checked for risk factors for heart. You are young and primary prevention is possible. Take care Wishing speedy recovery God bless Good luck