Usually the neck /and neck muscles are involved somehow with most concussion accidents..
Consider some therapy for your neck, do a web search on trigger points and muscle spasms to learn more, or get an evaluation by a expert PT or expert chiropractor that uses gentle and soft tissue therapies...
Trigger points can refer pain & symptoms - headaches, foggy/blurry vision, and much more..
You can do some self treatment easily usually with a tennis/golf ball or such.. thumb or fingers if you can reach the spots..
See if that reduces the problems you are having..