Vertigo
Vertigo is a symptom of a balance disorder, an illusion of movement when no movement is present. It may feel that you are spinning, tilting, rocking, or falling within your surroundings. You may vomit or have ringing in the ears (tinnitus). Also, your eyes may uncontrollably jerk back and forth. True vertigo, from the Latin "vertere," meaning to turn, is a distinct, often severe form of dizziness that is a movement hallucination.
Vertigo can be caused by inner ear problems, or a problem in the brain. Usually harmless, vertigo can be a sign of a serious condition if accompanied by difficulty in speaking or walking, severe headaches or double vision.