I am not quite certain what exactly they mean by balance testing, but if I had to take a guess, I would suspect that since they think your IIH may be caused by an antibiotic perhaps you have suffered from otitictoxicity. Some antibiotics are known for causing destruction within the inner ear hair cells that are responsible for maintaining our balance. When this happens it pays havec on our brain trying to keep us upright, and causes awful dizziness and disequilibrium. That is sort of what I have. Does any of that sound familiar? If it does, that type of testing, the ENG/VNG/VEMP/ caloric testing, rotary chair, etc. does not cause long lasting issues. I was stable again within just a few seconds after each series of tests. Had a bit of brain fog, but it was manageable.
Again, not sure if this is even what your docs were thinking!?! Could you find out a bit more info?