With 27 years of experience, and as a clinical professor of Neurology at Weill Cornell Medical College, Dr. Sun is a leader in his field. If you’re experiencing symptoms like headaches, numbness, neck or lower back pain, focal weakness, double vision, memory loss, unbalanced gait, dizziness upon standing up or quick movements, loss of feeling or numbness in extremities, and being easily fatigued, consult a neurologist right away.