My wife is feeling spinning like feel.

Dear doctors, My wife is 36 years old she is feeling like spinning around since last 1 - 1.5 months. We had checked with GP he didn't suggested anything gave some medications that helped for a while but problem was not resolved. We thought this might due to neck pain as there earlier history of neck pain so we had consulted orthopedic . Orthopedic also suggested nothing major gave some tablets which didn't worked. Later we suspected it may be due problem in eyes or vision so we had visited opthalmologist. Opt. Confimed that there is no issue with eyes or vision. Now we are not sure which doctor to visit to address the issue of spinning like feeling. There is no other issue but she always feels that there are spins in head and she may fall down during routine activities. Requesting to suggest how to proceed with further treatment or diagnosis. Thanks for support Vishal