My 14 year old daughter keeps passing out. She gets dizzy, clammy, starts sweating profusely and then she says everything turns black. This all happens when she exerts herself like in gym class. Her gym teacher says that she becomes unresponsive and her pupils get very dilated. She s had a holter monitor, ekg, stress test, and an echocardiogram and they all are normal. What do I do now?