Hi there. common causes of dizziness are low blood pressure due to anemia etc, heat stroke, dehydration, vertigo due to disturbed body equilibrium, benign paroxysmal positional vertigo, meneire’s disease, and inflammation of the inner ear, heart problems like heart attack, irregular cardiac rythms, rapid or slow heart rates, cardiomyopathy, certain drugs like beta blockers, pregnancy, high blood pressure etc. considering the wide range of possibilities, consult a physician and a detailed clinical examination along with certain blood tests and cardiac assessment is required for diagnosing the cause. Management will depend on the cause. Take care.
Since it seems to involve a change of position in the head, my first thought would be an inner ear infection. Having one of these could definitely be responsible for your dizziness. I would schedule another appointment with your doctor to have him/her check for any inner ear abnormalities, or possibly sinus problems. Good luck.
Sara RN