Most beginning flute players waste a great deal of air when playing – you can tell by the fuzzy/breathy tone. Whenever you repeatedly and rapidly exhale a great deal of air, you run the risk of hyperventilating. When you blow out too much carbon dioxide, the blood vessels that carry blood to your brain constrict, which leads to lightheadedness, tingling in your fingers, and possibly a loss of consciousness. Learning the correct way to produce a tone will stop the dizziness.