Crystallady,
I was always told by Dr. Chang that radiation induced side effects could occur anywhere within the first 18 months after treatment. Certainly the % drops the farther out one goes, but it can occur. Also symptoms may be related to swelling which is what most folks tend to assume, but also can be brought about by irriatation of the nerves involved or interaction with the AN going through Necrosis. I assume you had a MRI at 6 months which should have given some indication of how the tumor was reacting at that point. So it would not be uncommon to be experiencing some swelling and I would wait to see what your 1 year check up shows. If the symptoms continue ask your doctor about a short dose of decadron or some other steroid. Not great stuff to be on long term but can reduce swelling or irritation symptoms
Best wishes
Mark