It is also near the optic nerve - but double vision is not typical, usually pressure by something causes
deficits in vision to the sides, not double, but the double could be fatigue.
You should see a neuro-opthomologist, a neurologist, and/or and neuro-endocrinologst to get evaluated. Is there some sort of way you can do that? I am not sure the ER is the best way, but a clinic or study?