Jen,
Wow, another work place assault. Since you have Oregon WC, you should google 'work comp attorney oregon' You will find quite a list of attorneys. You want one who understands closed head injury/concussion/mTBI.
It is not uncommon for WC doctors to deny your injury because you can walk and talk and look normal. Maybe your boss can help you find a good attorney. There is some good info at
www.subtlebraininjury.com and at
www.tbilaw.com . You want to be prepared for the different diagnostics they may want you to have. Some are biased against prolonged concussion injuries.
Try to be informed. It will help as you work through both the WC process and your recovery.
My best to you.