Perfect Eyes ~
I'll offer my assent to the advice given by james e and add that I would ask the ENT to order an MRI head scan - with contrast - to 'rule out' the possibility of a skull-based tumor (acoustic neuroma). At this juncture, the exact cause of your symptoms is unknown but by having the MRI, it will either help you and your doctor to be assured that the cause is not 'internal' (and, if tiny, difficult to see with a CT scan), or that you do have an acoustic neuroma. If so, a treatment plan can be formed and save you a lot of time and possible discomfort chasing down phantom causes (for your symptoms) that don't exist. If the ENT you consult does not want to order the MRI (a physician has to do this) seek out another doctor, perhaps a neurologist, who will order the MRI.
Please keep us updated on the MRI results, AN or no AN (I hope it's the latter). Thanks.
Jim