Harrison It sounds really wierd, I mean, sinuses and eye strain, WTF do they have to do with each other?
However, the nerves that are actually causing you eye strain also interact with your sinuses, and the nerves in your sinuses also interact with your ears, TMJ, and jaw muscles. The nerves in your face are all very highly interconnected. So when one is irritated it can effect areas you wouldn't think. In my case I was having pretty bad ear, TMJ, and jaw pain for over a year, no one could diagnose it, scans came back fine, doctor after doctor was baffled. I finally found a great ENT who did a different type of scan and found my sphenoid sinus was completely blocked and infected. I had surgery to correct the issue, and after recovering, my ear, TMJ, and jaw pain vanished. And when I get a sinus infection, the pain comes back until the infection clears up.
I have also heard stories of people who have had non related pallete surgery, but as a side effect, it cured their migraines.
I don't think it's really helpful info to have since there's nothing you can really do with it, but it helps remove some of the mystery