Do you live near an NCAA college? Check with their sport medicine department to find out who does their concussion management.
You should also check out
www.tbilaw.com. You may be able to get a good referral. The worst thing you can do is get examined by a neurologist who does not have a sound understanding of concussion. Your family doctor is probably very weak in his concussion knowledge. Otherwise, he would understand your need to rest your brain.
Spend some time reading up at tbilaw.com. Attorney Gordon Johnson has one of the best resources for accident victims with head injuries.
A neuropsych assessment might be worthwhile. But again, you need to be careful. Read tbilaw.com. It will be the best information you will find. If your concussion symptoms end up being long term, you will need to be adequately prepared legally.
btw. The neuro who wants cash up from knows how long insurance companies take to pay, especially if there is litigation involved.
Have you talked with an attorney yet?