Try seeing a neuro-optomotrist or neuro-opthamologist. They assess vision from neurological perspective and have experience in assessing (and treating) folks with brain injury.

There is more information on NORA's (Neuro-Optometric Rehabilitation Association's) website under the "Patients" tab. Click on that tab, then go to "Vision and Brain Injury."

It's a lot of information, so if reading increases your PCS symptoms, cover up whatever you're not reading and do it little chunks.

Good luck!