Hearing loss. Damaged hair cells?

As a result of Bone TB at the bottom of spine almost 2 years back,I was given streptomycin injections.About 3 months back,hearing got impaired with 56 decibles left ear and 65 decibles right ear. I am wearing phonak brand aids with 12 channels,RIC type with single domes as advised by audiologist.But, I hear my own voice louder thru the ears.Also when others speak their voice sound is heard with a booming effect,with the result that,the words get partially obsorbed by the accompanied booming effect.Audiologist says the booming effect and louder hearing my voice will subside over a period of time as I am relatively new to the hearing aids.Impedence test shows a perfect middle ear.My problem is 1) How to suppress my own louder voice sound 2) How the booming effect can be contained appreciably so that I am able to pick up words of speech of others. Is the booming effect because of remaining cochlear hair cells overworking against damaged hair cells? Pl advise.