hi i had gone through your query and understand your concerns.
-first you know the what is the underlying causes for the development of vertigo?.
because vertigo is not a disease per se ,it is only a symptom or complaint of another disease.
-i would come up with the following possibilities,cervical spondylosis
you need rule out the underlying cause then take appropriate treatment for permanent cure
don t use medicines on symptomatic basis is strictly advise for you
wishing you good health