What can cause dizziness and lightheadedness and chest pains but EKG is fine as well as blood pressure? Have totally passed out and couldn't see

Arrythmia/Valve. This could be an intermittent dysrythmia/arrythmia and could also be a heart valve issue (less likley). It could also be dehydration, anxiety and some other more obscure diagnosis. Get over to your doctor or emergency room and get checked out. If this occurs again, go to the er or call 911.
History Important. Note : frequency, "auras"' sudden onset, position, provocative factors, duration of symptoms, witnessed signs, preexisting medical conditions: hyperventilation, panic attacks, diabetes mellitus autonomic neuropathy; antihypertensive medications epilepsy or narcolepsy, family history, recreational drugs, seizures. Review with your physician.