question: my daughter aged 19 has had fainting episodes for past year has fallen to ground and a little disorientated. does feel fainting about to happen is not always in a position to be able to sit down before it happens. feels her eyes flickering and last few fainting episodes has complained of headache on right side. does have a bp of 90/56 and heart murmur has showed up on echocardiogram. what would most likely diagnoses be.