Calimama,
to answer your questions:
Yes, my An originated in the IAC. At the time of treatment my hearing was 70% down and of not much use anyway. Hearing preservation was not a factor in my decision; I just wasn't comfortable with surgery. Swelling worsened all symptoms as it stretched the nerves further, and gave some new effects, like the short sharp pains behind the ear. Fortunately those did not last for a long time. While the tinnitus went back to its original level, the hearing nerve did not recover from the swelling. I think that's normal. I lost an extra 5% apparently. But, as I had no useable hearing form the start the extra loss made little difference to me.
Just a quick point about hearing preservation: FSR offers a higher chance of hearing preservation, but does not guarantee that you will preserve your hearing. This said, personally I think with the kind of hearing loss you have small hearing loss following swelling (if swelling there is) may not have that much of an impact. I'm not sure if others here that had CK also had further hearing loss.
Permanent issue now: from a purely AN point of view, none really. No pains. Balance is the same as before treatment, tinnitus is back to it's old self, hearing is useless just as much as before CK, headaches when weather / air pressure changes which I also had way before diagnosis, fatigue levels have decreased dramatically and I'm now back to a better energy level, better than for a very long time.3 years out, I can honestly say I haven't felt this positive and well for a very very long time.
The pons is the brainstem. 30% plus tinniitus could be of some use, and it might mean if you need to, you could get one of the normal hearing aids. Recovery from FSR seems in general to be easier. It really depends on individuals. For me, the first 8 months were the worst. I could work, but had to reduce the amount of work I did. But improvement in energy levels and cognitive abilities were at times gradual, at time sudden. Eventually things returned to normal. I'm glad I decided to go the Ck route and that I could chose that option. I'm not sure about possible risks down the road, or what they might be? If you mean the risks of a malignant tumour, the risks of that are at the same levels as having a tumour from any other cause, as far as I know. Unless some recent study shows that this has changed.
All the best,
Lorenzo