The pain on the left side of the face may be due to some infection in your tooth. You should go to a dentist
and get a dental checkup done. If there are any positive findings, you should get the treatment for the same. Regarding the blurring of vision, you should get a refraction
and fundus examination done from an eye specialist so that the underlying condition can be treated.
For dryness of the eyes, you should use some lubricating eye drops 3-4 times a day and do reading work to the thresh-hold of fatigue