The New York University Langone Medical Center, on the other hand, reports no marked increase in blood sugar levels in diabetics. As a precaution, however, you should discuss fish oil supplements with your health care provider, if you have diabetes. If you're already taking fish oil supplements, keep a close watch on how your blood sugar levels vary.
Another condition that can cause headache above left eye is glaucoma. This condition is due to the build-up of pressure within the left eye that causes damage to the optic nerve, destroying peripheral vision and leading to blindness. Any infections or tumor in the left eye or brain can cause pain around the eye.
I know people who died from a stab wound to the leg. Yes you can die from a stab to the eye. Right behind your eye is your brain. An object strong enough to penetrate your skull can easily cause a bleed inside your skull which will squeeze your brain till your heart stops (that's me putting it in simple terms).