My mother is suffering from a problem that no doctor has been able to diagnose. She has bad dizzy spells when she gets up from a seated position. She has even passed out a few times. She has had almost every test known and nothing has shown up. Her blood pressure will go up when this happens but then go back to normal. She has been to heart doctors, internal doctors, Neurologists and none of them can find the problem. If she stays on her feet she does not have these spells. Please if anyone can help it would be greatly appreciated.