BB, I can't answer re surgery questions really as I did not have surgery, I had fsr radiation treatment for my An. As to meneiere's I have been told i have c hydrops and aied. This came about after ear pains, pressure, loss of hearing in the non An ear plus all in the An one, and episodes of imbalance and increased tinnitus. I'm a year and a half out from my An treatment. I was using a steroid drop in my ears and my hearing came back almost to its previous level of loss in the non An ear so I haven't begun the steroid pills yet. The last few days though my hearing seems worse again, so i guess i will be seeing my doc next week. Plus I had an attack of some sort in my ear /head today with the roaring tinnitus, imbalance and pressure etc. I am still in the stage of learning more about it, talking to my doctors and making decisions etc....
I do know of a person who had An treatment (who also had a small An in the second ear as nf2) who was thought to have AIED about a year after An treatment. Since even a small An can cause hearing loss it's an interesting/hard call as to whether its from aied or the An itself. It really is rare though.
It's hard not to be stressed as you are without ins right now, I know, but hopefully your coming mri will bring continued good news in your recovery from your An op last year. Your doctor sounds on top of things so that is good. Seems you are in good hands and your An surgeon should be able to tell you more after your mri. I hope you have a neurotologist too who is familiar with inner ear problems. Perhaps the water pills will help you too. See if it helps. There are helpful hints on the meniere's site for that also.
all the best, good luck,
W.