My 19 year old daughter (5'4" 120lbs) is short of breath while walking up a flight of steps. She gets light headed and dizzy when getting up from bending over, sees spots in her vision. She recently had a dental surgery and they stopped the proceedure because her heart beat went up to 163 bpm. I have had her to two cardiologists they both say she is fine, offer no explanation and are starting to look at me like I am nuts. I did persuade one of the doctors to order her a stress test she goes next week, for a Nuclear Stress test. Where else do I go from here if that comes out ok?