I'm obviously not a doctor, but I've been through all of this and have read the stories of many people. I do think it is correct that symptoms can vary and change over time, and they are not linear. What I mean is, while there may be a general correlation between tumor size and symptoms, those correlations are not always clear nor consistent, both from patient to patient but also for an individual.
I do know there is pretty clear medical evidence that steroids can help recover sudden hearing loss. (I was also given steroids when my hearing loss was first discovered.) So, it could be that as those wore off, the symptoms came back? obviously I don't know. What I'm trying to suggest is that a change in symptoms is not necessarily an indication of rapid tumor growth.
Your tumor is pretty small, so W and W seems smart. But the symptoms are certainly frustrating.
good luck!