Vertical Heterophoria. Someone help pls?

I am having a imbalance problem for nearly 1 year and the symptoms is reduce to 70% for now but still unable to drive a car in the highways. I don't have a problem in driving in the city and traffic areas, it happens only when I drive in the highways. Before an year, I was suffering from severe Adeno Viral Eye Conjunctivitis for 15 days, my left eye was severely infected and also got white spots later. The White spot comes in left eye, stay for 2/3 days and goes automatically. I drove the car for nearly 500 km in the mid noon as soon as my conjunctivitis was cleared, so I suspect the sun rays affected my left eye which was already weak due to the infection.I have visited all the doctors for this imbalance problem, General Physician, Eye Specialist, ENT, Neck & Spine & also Neurologist. Nothing worked. So i kept searching the google for the answers and found about Vertical Heterophoria. Can someone help pls? http://dizzinessandvertigo.weebly.com/vertical-heterophoria.html