Hi There....I am so sorry that this accident happened to you
I am not an expert and can only advise you based upon my experience as I sustained a concussion at work as well....as you can see, I've been dealing with this for a very long time...
I would retain an attorney immediately. It's obvious to me that the MD you went to for WC has no clue regarding post concussive syndrome. You need someone who is well versed so that you can receive follow up care as soon as possible.
I never felt that the insurance carrier was "for me" and I was proven right repeatedly. You truly have to advocate for yourself. No job IS worth your health, trust me on that one. You only get one brain and you need to take care of it...
Sorry I can't offer you more, but I know there are many people on here who can...know that you're not alone and you'll receive alot of support here
My best to you as you work your way through this!
Julie