Well, here's the scoop on post-concussion syndrome - most resolve quickly, but not all do. From your description, I would expect your H to be of the quicker variety. Depression and/or attention problems can occur, though, (in schoolkids you sometimes see their schoolwork go downhill), so just be aware.
In researching it this time with H's most recent episode, I found some interesting research on gingko - okay, so they used it on concussed rats, not humans, but the results were pretty impressive. I did have a patient once who had a severe post-concussion syndrome that lasted quite a long time - she got better quickly after her father recommended she try gingko. I was never sure at the time if it was just placebo-effect or not, but now with these rat studies, I found it convincing enough to make my H take gingko this time - you might want to try it.
