My symptoms lasted for 3 or so years then more or less totally disappeared, thankfully. They would only return very occasionally if I was particularly stressed out, sleep deprived, or otherwise not doing well.

A recent and very, VERY minor blow to the top of the head has caused them all to return, which is why I'm on this forum. This blow was really quite insignificant, and I was shocked that all these symptoms returned so dramatically. It makes me think that something must have been lying just below the surface, even though I felt more or less fine.

Anyway, happily it's been a week and I seem to be getting better in leaps and bounds this time, probably because the blow wasn't bad at all. I expect to be near 100% within another week, knock on wood.