the issues you describe are related to the trigeminal nerve, which is obviously being affected by the tumor. The trigeminal nerve is quite resilient, and it does heal once the pressure is removed.
I also had very pronounced numbness throughout the face, altered taste, lack of sensation on the cornea, the whole range of trigeminal symptoms.
All these symptoms disappeared right after surgery. They did reappear briefly after a few weeks (rapid onset), at which time my surgeon told me that sensory nerves can experience fluctuations. They did disappear again, and they never appeared again.