As usual, all that worry was a waste of time and energy. The neurologist said it's just post concussive syndrome. From what my doctor had said and how the symptoms matched, I was thinking it might be chiari malformation, which would be more serious. Consulting Doctor Google is often not a good idea. :)
Anyway. I'm in the middle of another days-long headache, so I don't really have much more to say.
Oh, Happy New Year! Here's hoping for a better year this time.