You received some ototoxic medications in the course of your treatments.

"Ototoxicity is when a person develops hearing or balance problems due to a medicine. This can happen when someone is on a high dose of a drug that treats cancer, infections, or other illnesses. When doctors find ototoxicity early, they may be able to prevent it from getting worse".

You should seek treatment ASAP! The link here should provide an insight about your diagnosis and the prognosis.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5894487/

Wishing you soonest recovery!