Depending on how your concussion happened, you could also have neck muscle tightness or strains or trigger points in the muscles..these can cause headaches..and vision issues. Much info online about trigger points, drs just don't tell us about that...or they don't know, they'd rather RX a drug..

Often neck muscle tightness and trigger points creep up on us and we don't notice it until proper therapy starts to help or resolves it..

You might be overly focused on these possible head issues - when some quality PT and soft tissue therapy is needed.