Donna, I would suggest that you see either a neurologist first, or split the difference and visit a "Chiropractic Neurologist" in your area.
These types of DCs take a unique approach to evaluating brain function, and are very different than conventional chiropractors in their methodology. To find someone close by, call the Carrick Institute (www.carrickinstitute.org) and ask for a referral near your city/zip code.
It's nearly impossible for me to explain the disturbance in your visual field without knowing more details of your head injury (the fracture, how it's healed over time, etc).
If the neurologist offers little help, and there's not a chiropractic-neurologist within a reasonable distance, I would recommend finding an Upper Cervical chiropractor to handle your adjustments (www.UpCspine.com for a referral directory) - look for a NUCCA, Atlas Orthogonal, Grostic, Palmer-Specific or Blair practitioner for this type of care.