It's important to know there are ways you can manage hearing loss that were not available even a few decades ago if your hearing doesn't improve. Of course, our first choice is complete healing, but if that doesn't happen you will have some options depending on the severity of your hearing loss.
For example hearing aids are more sophisticated today and cochlear implants are more available.

Sudden hearing loss is more common than most people realize.

Did your doctor explain why an MRI is routine?