Yes this could be inner ear disease
as you said you get dizzy on turning head there are high chances of inner ear disease.
You must go to an ENT specialist
1. get your ears checked as they might be caring some infection you are unaware of.
2.get checked for nystagmus
, get done balance tests like standing .stepping ,writing ,rhombergs etc there are many clinical tests then you can get done some other tests like rotational chair tests , VNG ENG whichever you doctor decides.
get done Pure tone audiometry(hearing tests),SISI etc and MRI
Brain with contrast with special emphasis on posterior cranial fossa
This can tell you if the inner ear is diseased or not.
Dont get afraid of so many tests as the tests are done in a step wise manner and every test is not meant for everyone.