First do the following:
1. Ear examination to rule out or clean any Ear Wax and Ear Drum examination.
2. Pure Tone Audiogram (PTA).
3. Impedance Audiogram (IA).
4. Give a detailed history of the unsteadiness.
Are you having discharge in the ears? If that is the case then it could be infection, mainly otitis media. The other possible cause could be the vestibular apparatus being affected.