Open Question: Why can't i see out the left corner of my left eye?

Earlier, this weekend, I had a brief but sharp pain in the right side of my head that felt like it was pulsing. I believe this was caused by a stressful situation. Shortly after that, I was unable to see out the left corner of my right eye. Two days later, my head started hurting on the right side again whenever I shook my head, nodded my head or bent my head over. I went to a doctor and they say it might be due to sinuses. Could it be anything else?