Hello Madison and welcome.
We have quite similar timelines in our treatments, although my GK was a bit later than yours, in April 2008. I had my one year MRI last week and I understand exactly how you feel. I had the jitters to such an extent that some odd symptoms, like pulling sensations and fullness appeared. I am sure now they were due to the stress because after the MRI they disappeared magically.
To answer your question, I don't think it is uncommon to experience symptoms like fullness, increased tinnitus, feeling light headed (or "wonky headed" as we say around here) intermittently. Irrespective of whether radiosurgery has been successful, we must remember that the AN is still there, exerting pressure to the nerves, reducing blood flow etc.
I have noticed that for me stress is a big factor. Whenever I am very stressed I notice that the symptoms may intensify. Viral infections hit me hard on the head too (and I get quite a bit of those, with two young kids in school and daycare). Getting a good rest, and increasing blood flow by exercising and hot compresses helps enormously. Ibuprophen has worked whenever I had increased fullness in the ear.
Overall, I would say that I don't expect that I can be entirely problem free - after all I do have an AN. I am just happy that whatever symptoms I have are so mild and transient, and usually resolve by themselves.
Keep us posted about your MRI. Don't hesitate to write about your experiences and ask questions. By the way, what is the size of your AN?
All the best,
Marianna