Your symptoms of dizziness, 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. Please consult your GP who will examine you and may ask for blood tests for evaluating blood sugar and CBC.
Hope this helped and do keep us posted.