I got deafness in both ears due ro acute renal failure 8 years ago but only recently i've been feeling vertigo and it wont go away. how do i fix this?

Vertigo: You need a diagnosis for your vertigo before you can "fix" it. Your case might be unusual. Deafness from acute renal failure is unusual, while deafness and acute renal failure from a common underlying cause, like drug toxicity, is more common. First step after good history and exam would be a full vestibular eval including ENG/VNG. This can be thru ENT or neurologist.