Hi aarti ! Let me explain in simple word! Inside ear their is a box , on the floor of box their are hair like structure which sensitive to touch. Now inside box their are sand like particle which move when person move head and touch that part of floor hair. Then brain translate how much you are tilted and give signal to brain for making balance. Phew ! So when this system disturb. People feel vertigo
or surface is moving . Just consult doctor
for medicine change or ask physiotherapist about new treatment or last is surgery. Take care be healthy soon. Bye.