Hello. Sorry to hear you are going through this. I was first diagnosed with my AN back in July. It was only 13mmx12mm but was causing me to have unexpected bouts of vertigo, which sometimes left me feeling dizzy and off balance for a week at a time. I also have loud tinnitus in the left ear, which I'm just used to at this point. Typically, the vertigo itself would only last around 10 minutes. My choices were to watch it, do stereotactic radiosurgery (aka Cyberknife) or surgery. I just turned 50 this year and have been regularly going to the gym for years, so I felt very healthy. I chose to do the radiation instead of surgery due to the possible complications that could cause (almost guaranteed loss of hearing in my left ear and the risk of damaging my facial nerve, which was really my main concern.
I had the radiation treatment back on August 20th and ever since then I have been off balance and feeling dizzy. Sometimes the dizziness is worse than other times and seems to be related to me being tired or not drinking enough water, but thankfully it doesn't cause me to feel nauseas. Still, it has been a major annoyance that I am off balance so much. I go for my follow-up MRI today to see how my AN is doing. In a way I hope it actually got a bit bigger to help explain my symptoms, otherwise I'm not sure when this will all end.
If you are having significant symptoms from your AN, which it sounds like you are, I wouldn't be a fan of just watching and waiting because it will likely only get worse. Only you can decide what is right for you on the radiation or surgery front. I never expected that the radiation would cause me to feel this way for this long, but then again it's only been 3 months and I've been told it could last for 6 months or a year (or more). Still, I stand by my decision to have the radiation done before actual surgery.
I hope this helps. It makes me feel better talking to others that have similar experience because although my family is aware of my situation, I just don't think they can fully appreciate what I feel like every waking minute of the day with my dizziness and balance issues.
I wish you all the best.