I would recommend being evaluated by a psychiatrist or psychologist.

If you are depressed, either because of a chemical imbalance or suffering from situational depression because of the chronic pain (most Cp'ers do have depression) they may be able to help with those issues.

Additionally, they may be able to directly help your case against the WC company by documenting that they feel your headaches are not psychosomatic in nature.

I'm sorry that I do not have any advice specifically about post concussion syndrome, but I believe that documentation/evaluation by mental health professionals could help your case.

Good luck