My daughter just called and while she was running, she blacked out and fell to her knees, she was disoriented and nauseaed with a headache.  Her heart was beating faster than it ever had.  When she was in high school she saw a cardiologist but they didnt find anything wrong.  She periodically has minor episodes but never one this severe.
Hi, Thank you for posting your query. I have noted your daughters symptoms. She needs a detailed cardiac evaluation to exclude a cardiac arrhythmia 9an abnormality in the heart rhythm). This can be done by doing a holder monitoring of the heart. The episode of transient loss of consciousness is called syncope, due to poor blood flow to brain. Head up tilt test (HUNT) test would also be useful in excluding a neurocardiogenic syncope. I hope my answer helps. Please get back if you have any follow-up queries or if you require any additional information. Wishing you good health, Chat Doctor. Ly/