Hi, Bern ~
Like everyone else, I was sorry to learn of your new symptoms that - according to your recent MRI - don't appear to be directly connected to your irradiated AN. Of course I hope your consultation with the neurologist can help shed some light on the cause of these disturbing symptoms. However, it's hard to simply dismiss your AN treatment (radiation) as having absolutely nothing to do with this development. I'm certainly not a doctor but because of the sensitive location of the AN, it seems as if even a tiny bit of swelling, which is common, post-radiation, isn't the possible cause of the new symptoms. I can easily understand why you're worried about this but until tests can be done to explain the symptoms, worry will be of little use, even though it is a perfectly normal reaction.
For what it's worth, I underwent FSR just about 3 years ago. This summer, I've experienced some unpleasant sensations in the 'AN area' of my skull that I attribute to residual swelling of the dying tumor. A scheduled MRI next month should prove or disprove my theory. My point being that with radiation treatment, swelling can occur for a long time after the treatment and sometimes cause annoying, even scary, symptoms. I trust yours will soon subside and you'll be able to move on.
Jim