I cannot tell what direction the sound is coming from, as it all sounds like it is coming from the left (working) ear.
I had all those symptoms before the GK too. The GK did not cause them, the tumor did. I have worked on balance exercises since before GK and continue with them daily. I also walk between 8,000 and 10,000 steps a day.
I am able to drive a car, turning the head quickly can cause imbalance, but I have the steering wheel to hold on to should that happen, and I'm in a seated position. Its only happened a couple of times. Never had vertigo while driving (did have a passenger, I think because you aren't sensing what the car is doing).
It sounds like you are in OH (or close to it). Is there a local AN chapter you can connect with to discuss where folks have gone locally for treatment? Also, there is a list of questions to take to your visit(s). Hopefully you found that. Those were helpful.
Its a super personal decision, whatever treatment method (or no treatment) you decide on is right for you.
I'm 56. I decided that I did not want my head opened up if I did not have to, so GK seemed correct. If my tumor begins to grow again, I would likely go for the surgery at Mayo. I don't foresee that occurring, but there is always a chance. And this is what I have decided for myself in my situation.
Remember that most folks post who are having an issue, and the ones who were treated successfully normally do not return to this site. I check at least a few times a week in case anyone has any hints on balance. I got the hint to take ginger capsules from here in the balance portion of the boards.
Wishing you peace on this journey - and keep us informed as you progress.