Keep in mind that there are multiple potential causes for your symptoms. The experts are the ones to have figure it out, even if it takes a while. They’ll start with the most common causes that fit the symptoms and work their way down the list of less common causes if needed. My wife’s tumor is near the bottom of the list with one source saying only 50,000 cases in the entire US population.
She has dizzyness, lightheadedness, and some vertigo (spinning feeling). They initially tried the Epley maneuver, which seemed to help but did not provide the amount of improvement that they had expected. It wasn’t until the MRI that they identified the cause. Since they diagnosed the vestibular schwannoma, she’s been to therapy to try to get her brain to ignore the bad side and pay attention to the good side. This has helped some. I’m hoping this is not the cause of your problem. From what I’ve read, some schwannomas are operable. It varies on location and other factors.