My son was terribly prone to inner ear infections when he was little, so I used to be totally up on my inner ear infection symptoms.
In case you're interested, an inner ear infection is also called labyrinthitis. It is slightly different from a regular ear infection, and is usually caused by a virus, though sometimes bacteria can play a part.
The symptoms of inner ear infection are imbalance, inner ear pressure, and dizziness; and if it is particularly serious, then the person can experience hearing loss and tinnitus.
Luckily my son never got that serious, but he did have quite a lot of inner ear pain. Before we knew it was an inner ear disorder, we tried all kinds of middle ear infection treatments, but of course they didn't work.
The only thing that ended up working for my son was prednisone, but I know that some people have to undergo really extensive inner ear infection treatments, such as balance training, and even anti-nausea medications to combat the problems that come with imbalance.
I'm just thankful we never had to go that far -- my son's problems cleared up as he got older, and now he's just as good as new.