My heart is beating hard (not fast), and i feel light headed and am flushed. my bp is normal, and i am not anemic or depressed.what could be the cause?

Cardiac evaluation: You will need to have full cardiac evaluation including ekg, bp/hr monitor as well as blood test including thyroid hormone levels. If your symptoms are episodic you may need an event or holter monitor. Certain medications, caffeine and drugs can causes these symptoms as can panic attacks.

Stress, hypertension: Stress, hypertension or an arrhythmia. Check it out with a doctor.