Hi, ces!
Where in NH are you? I'm in Littleton, MA and there's a good representation here from us New Englanders. Are you seeing someone in NH or have you been referred down to the docs in Boston?
As others have said, the best definitive diagnosis for an AN is via MRI with contrast. MRIs done w/o contrast can sometimes miss the AN. You won't know for certain until after that MRI. But for the 3rd (assuming you won't have the MRI until after), be prepared to talk about any possible related symptoms - headaches, facial tingling, dizziness, balance, dry eye, or anything else that seems off. Even if it's not a recent development.
Once you have the MRI, you can ask more about exact size and location (if it is an AN). Those, along with your personal circumstances, will determine what you do next.
Good luck, and keep asking questions! Let us know how things go on the 3rd.
Katie