If neurological examination is normal, including CT and MRI then chances are that you have positional vertigo of peripheral origin. Prolonged anti-vertiginous (labyrinthine sedatives) tend to prolong the recovery. Adaptation exercises help. You need to see a neuro otologist who can assess the nature of the positional vertigo. If it is Benign paroxysmal positional vertigo then manoeuvres like Epleys proformed by the ENT doctor help. If it is a transient vertigo occurring in all change of positions then carbamazapine is reported to help these patients. Cardio consultation to rule out cardiac cause or orthostatic hypotension should also be done.