Read up on California Work Comp law. You have the right to be seen by your own doctor at WC expense. You may benefit from being assessed by a Physiatrist (Physical Medicine and Rehabilitation) Kaiser has such a department. A specialist in NeuroRehab will be worthwhile.

Also, read www.tbilaw.com and www.subtlebraininjury.com.

Calif WC law makes it difficult for concussion injuries to be properly treated. You need to do the work yourself until you find an advocate in your corner.

My best to you.