This is simply my personal opinion, based on only the thoughts that have run through my head since I was diagnosed in June '14. At your age, with your size tumor, I would wait a minimum of one year before I even considered surgery. Set time tables for yourself. For the next year, spend your time learning all about this problem, and seeing that your emotions WILL MODERATE. Even in the next few weeks, you will see that it all becomes easier to deal with. DO NOT let your emotions get the better of you, as some, unfortunately do. In some ways, this is a very big deal, in others, it isn't.
Keep in mind the following. Often, with surgery, they leave behind as much tumor as you have now. People with 3cm tumors come out of surgery with more left behind that you have now because the surgeons play it safe in regards to damaging the nerves. Also, symptoms, as mentioned above, are very often independent of the three choices you have. Surgery, radiation, and waiting all have the same possible risks and benefits. Any of the three could make your symptoms worse, better or they could stay the same.
Also, while there apparently isn't anything on the horizon, you never know what improvements in treatment could be around in ten years. The possibility of you being able to postpone treatment for ten years is not out of the question.
As for the symptoms, there are meds to help with vestibular symptoms. Do you get "vertigo", or are you actually "dizzy". I thought I have vertigo when in fact I was actually just dizzy. The vestibular symptoms can make you vomit over and over again. It is like a bad hangover. There are meds for this. With my nausea and dizziness, I get attacks once in a while. The rest of the time I feel "normal". When I feel myself getting dizzy and sick, I take a zophran which immediately stops the vomiting. I also take a med called antivert and a valium. These take an hour or two to stop the dizziness but at least I'm not vomiting. Sometimes when I feel a little "off" in terms of dizziness, I take a benedryl or two and it really works well. Ask your Drs about meds for dizziness and vertigo and get a few different ones. The ones that work best, for strong symptoms, will make you drowsy, very drowsy. The ones like benedryl, you can take half the dose (one 25mg pill) and you get used to the slight drowsiness for when your symptoms are slight.