Bob,
what you are describing sounds to me more like trigeminal nerve rather than facial nerve issues. Like Steve said, the facial nerve is pretty resilient to the pressure by the AN, but it is not uncommon for ANs to start pressing on the trigeminal nerve, causing numbness, odd sensations, altered sensation to the cornea (which can lead to dry eye) and/or pain. Having said that, I think it is a good idea to schedule your MRI earlier, to figure out if these new symptoms are because of new growth, or because of inflammation.
I was also feeling some weird sensations these last few days, and it just happened that my MRI was scheduled at the same time. I don't see any growth, so it is probably due to inflammation (or simply stress, as I was so stressed out). I found that high dose of ibuprophene and warm compresses to increase the blood flow help. If inflammation is the cause of all this, then a short course of steroids might help too.
I hope that your symptoms are simply due to stress and they will disappear soon.
Marianna