Hello FriendlyFriend: I'm just stopping by the say welcome to NeuroTalk! I trust you will find the time you spend here to be of benefit.

I'm sorry I am not able to address your concerns. However here's a link to a PsychCentral article regarding brain changes & how they can persist well after the concussion has occurred. (PsychCentral is NeuroTalk's sister website, by the way, in case you're not familiar.) Perhaps this article can at least get you started in the right direction. Also note the other articles there are links to at the bottom of the page:

Brain Changes Can Persist 6 Months After Severe Concussion | Psych Central News

My best wishes to you...