Just seeing this post. "Never seen someone with sudden hearing loss due to the AN" sounds to me like a misunderstanding, but you heard the same thing from two people, so ... maybe they are inexperienced?
My story is similar to yours, although mine starts with a slight hearing loss and a diagnosis of Eustachian tube dysfunction. Then came a more profound hearing loss, prednisone (prescribed by urgent care), audiology indicating sudden sensorineural hearing loss (SSHL) and showing that the middle ear was fine (i.e. no Eustachian tube dysfunction), confirmation that the prednisone was the right move, and an MRI just to rule out some benign mass that sometimes causes SSHL. And guess what? There was a benign mass--a vestibular schwannoma/acoustic neuroma (which I am sure was what the ENT had in mind all along when she said "benign mass," but that would have required a lot of explaining at that time).
Mine is big enough (17 mm) and I am young and healthy enough to lean towards surgery, which I have scheduled for June (but may push out a little more). I have had a couple of hearing tests since the diagnosis, and it has improved a little each time, but it is still not nearly good enough to be considered functional. I picked out CROS hearing aids two weeks ago, and I go to pick them up today!