Hi Greg:
I have been diagnosed of an AN (very similar in size as yours 5mm) a month ago. I went through the same dilemmas as you are going through now. All my doctors were of the opinion to wait and watch. My only problem is tinnitus. AN was discovered by accident. I have perfect hearing now. So the doctors have the opinion that by waiting the only thing I might loose is hearing, which in anycase can be a very possible side effect if I go for surgery.
As for balance, I am also an acute motion sickness person since I was born. However, because of my job I travel a lot and I still don't know how I manage them while continuously hating flying!!
My balance sometimes tips me off when I am very tired (which I am most often as I have the bad habbit of pushing myself). But, don;t worry very rarely we are in a place where we have nothing to hold, if required. If the balance cripples you then ofcourse there will be no choice left other than surgery.
I am 37yrs and I also had the same questions if not now then when to have surgery. I guess, that's future and my doctors gave me lot of confidence by saying go and do what you have to do as long as you can. Worry about it when it comes. My next MRI is after 6 months.
So I have convienced my self that I have at least another year of quality life and I should not let it go!!! So I am definitely enjoying the World CUP, having least amount of sleep, working hard for my career (my doctor dosn't believe that surgery will effect my career drastically, even if I become deaf and asked me not to think about it!!) and enjoying late nights!!!
cheers,
Anamika