Hi, its unlikely that a deviated septum can cause dizziness. Deviated septum can cause problems with breathing, as it causes nasal blockage. Your symptoms of dizziness and lightheadedness, if are relieved by eating something, indicate that you might be having episodes of hypoglycemia. Inadequate sleep can also cause tiredness, fatigue and dizziness. Other causes for these symptoms are inner ear infections; brain disorders heart problems, fever, stress, low blood pressure and anxiety. Inner ear infections, brain disorders and heart problems have been ruled out. So, if you eat a well balanced diet, sleep well and lead a stress free life this can reduce the occurrence of dizziness. Take care.
also saw a cardiologist everything was fine