There is a lot of anecdotal evidence of prolonged symptoms beyond a year or so. Check out tbilaw.com or subtlebraininjury.com Gordon Johnson addresses these long term issues and may have suggestions about how to get tested or to present your claim.

From what I understand, John Byler of "You Look Great" on YouTube and publishing (Amazon) has struggled to return to try to work. Maybe he has a blog or something with info. Maybe his sister Laurel Byler can be reached through her review on Amazon at http://www.amazon.com/You-Look-Great...rds=john+byler

I know that the Amazon review system notifies poster of replies/comments to their posts. I still receive comments to reviews I posted years ago.