This is the current concern i still occasionally suffer... pain/tension/pressure behind the eyes. Last year during a routine eye checkup they found out i had higher than normal eye pressure figures. I ended up suffering a panic attack there and then because my instant reaction was everything could only be explained by a brain tumor, but thankfully the optician also suffered from anxiety issues and he understood completely how to help me out!
I was given all sorts of tests i'd never had before, designed to discover if there was anything behind my eyes responsible, ie. tumors. They all came back clean. I was eventually told that the high eye pressure ran in my family so they'd keep an eye on it but was nothing for me to worry about. As for the eye pain/tension/pressure at the back of my eyes, it wasn't linked to the higher than average figures and was most likely due to stress/migraines. I was given the all clear. Not only that - my vision had actually slightly improved since my last eye test, and if i'd really had a tumor growing behind my eyes that would definitely have not been the case. Its nice to be given a thorough check over and be reassured i didn't have a tumor or anything, but every now and then when my anxiety flares up i ruminate on what could be causing my higher than normal eye pressure figures, then of course the eye pain/tension behind my eyes starts or gets worse than it already is... and i begin to scare myself by linking the two. They end up feeding off of one another to fuel my anxiety.
Sometimes it seems that not only are artificial lights unusually bright, but that subtitles on tv are blurry. Or like i'm seeing them in slight double vision. That concerned me so much that i went back to my optician, who again checked me over and reassured me i was okay. I also have astigmatism and am short sighted, so i guess that doesn't help!
Like mermaid and JunoX, i find that the pain/tension can be ongoing for long periods of time. All i can do is not focus on it unduly otherwise it does feel worse.