I am sorry to hear of this troubling vision problem. Eyesight is so important to us that changes like this can be frightening. The dizziness also complicates the situation.
While none of us on Connect are medical professionals and cannot make a diagnosis it does sound like a problem with convergence. Do you have any other health problems like double vision, balance or gait (walking) problems? There are many neurological disorders that can cause problems with convergence.