ten years ago, I had a similar problem, but one that persisted and then became permanent. I was diagnosed with an inner ear infection. After 9 months and my 3rd MRI, a grad student found it. I had a tumor on my hearing nerve which masked the original symptoms and mimicked the inner ear infection symptoms. A cat scan is useless, get an MRI.
I had the tumor removed, lost a tiny bit of hearing on that one side and regained my First class medical.