Diagnosed as child with otosclerosis, last couple years been having fluctuating hearing loss, vertigo episodes, ringing in ear. possible misdiagnosis?

Recurrent: Ear infections as child can caues otoclerosis. But your new symptoms seem unrelated to it. Get to a doctor or ENT specialist. It could be something as simple as impacted cerumen or complicated such as permanent nerve damage.

Otosclerosis: Otosclerosis can also affect the inner ear so may not be misdiagnosis. Evaluation with updated hearing test, ct temporal bones might be helpful.