This is not anxiety but what is called a propioceptive disorder, generally caused by a nerve palsy or an infection (usually, but not necessarily bacterial) within the vestibular organs of the inner ear. Sometimes making ginger tea from several slices of raw ginger steeped in a cup of water for twenty minutes taken three times a day will relieve the symptoms.
probably the breathing pattern your body creates in reaction along with the blood flow and amount of hormones released or lack of from the brain. it effects every thing from physical to psychological states.