I don't see how a chiropractor could help with a brain injury. If it is a neck injury however, I would avoid a chiropractor. I have read warnings from various medical sites about how the slightest wrong move can cause a lot of damage.

For example, my physio therapist says I have a compressed vertebral artery or something a few days ago. When you google that, you find out how patients who visit chiropractors are much more likely to later suffer a stroke from the condition than people who do not see them. May be correlation though.

I don't know. If it is just for pcs without neck complications, I have no opinion, good or bad My cousin says it helped her with her 1yr pcs.