I'm embarrassed to ask this...but for many years now whenever I am getting sick, like a fever or the flu, I notice that if I look all the way to the side of my vision it hurts my head. This only happens when I'm sick or getting sick, and I have no idea why. It's at the point where I sometimes use that motion as a "test" to see if I'm about to get sick. I found some article on it but I'm not sure.
Maybe it's this occular affectation, though I don't know: https://www.barraquer.com/en/news/afectacion-ocular-la-gripe-resfriado
Could just be eye strain haha. Does anyone else get that? It feels crazy to say.