You must discuss it with your doctor as as far as i know vancomycin
causes permanent hearing and vestibular problems.
You can start with antioxidants
and iron chelators -- for these to start discuss with your doctor as these drugs can be given or not and in what dose will be decided by the doctor.
Get done a Pure tone audiometry
so that a baseline hearing or if any defect has come in hearing then hearing deficit can be known.
It can also be known that the hearing loss
is actually due to drug or due to some fluid behind the ears or due to respiratory infection if its their.