I have been experiencing dizziness and some light-headedness over the past week. I took a bad fall with what was probably a minor concussion a month ago, but did not seek medical attention at the time. I also have aortic valve stenosis and regurgitation that is followed by my cardiologist. Echocardiograms have not shown any significant change over the past three years, but that is where my mind always goes if something is going on that I can't explain.