I had an appointment with my oncologist on Friday, and he said: "You are no longer on my worry list!" He told me the report was almost as good as I could expect, and not to worry about the non-specific finding - it was probably just a result of the healing process.
He said there was no physiological cause for my symptoms - leaving the possibility open that they are psychological, or are the result of some subtle damage they can't see. If the latter, he said the overwhelming number of his patients continue to experience improvement for up to a year, so there's good warrant for believing I'll also improve.
He gave me the names of some counsellors who specialize in treating cancer patients, and one appears to be a provider for United Healthcare (I'll know for sure Monday).
Meanwhile, I'm still going to see my neurosurgeon, Dr. Liau, on Wednesday. I'm sure she'll give me a good report as well, but I want to discuss my continuing symptoms with her.
My intention is to try to work through some of the confusion-related issues by returning to work part-time, starting Monday.