hello and welcome to HCM,
Since you have undergone septoplasty
just one week back there is always a chance of getting middle ear infection
which may be causing the block. Furthermore during the recovery phase of septoplasty surgery you may get ear block and nose block which should improve in some weeks.
Meanwhile you may undergo and audiometric evaluation to confirm the hearing loss
and also to try to find the cause of loss. This will also help you in the follow up.
Further since you are already on anti biotics you do not need any more medications. You may however add an antihistamine tablet if not already taken
Try steam inhalation also
take care and get well soon
Dr Sriram Nathan