Mark,
Thank you! You are a wealth of information. I live in an area where concussions occur quite frequently due to the popularity of adventure sports and athletics. Unfortunately, I have learned that there are few medical professionals with a depth of knowledge regarding the complexities of concussion. In fact, the statement that "symptoms that occur after 72 hours are not related to the concussion" came from the local neuropsyche who is recognized around here as the leading "expert" on concussions! My son's case has been both complicated and atypical and thus written off by the professionals who are supposed to be there to help.
This has been a frightening and frustrating journey and I truly appreciate the information that you have provided.