KM I have exactly the same issue. For example, I could play a console game for a couple of hours one evening and at the time have no ill effects. Often I find that the next day I wake up ok but a couple of hours later I start to get intensely tired and feel a heavy pulling sensations around my eyes. I also get pain as I rotate my eye around. The tiredness and heaviness are so severe that they can be utterly incapacitating.
I explained this to various eye professionals and they looked at me like I'm crazy. One optician even asked me whether I was simply imagining the whole thing.
The only instant thing I feel is that fast moving images cause me visual discomfort in my left eye. I strongly suspect my left eye is the source of most of my problems as that is where i feel the most discomfort and pain.
I have been tested for absolutely everything. I've had MRI scans, the full range of visual checks plus I spend a week with an eye patch on to see if this could tease out hidden eye issues. Nothing has been found to be physically wrong with me yet the severity of the problem is destroying my quality of life.
Years into this and its only getting worse. I still have absolutely no idea why this happens to me and even less idea how to help myself. I say help myself because the medical professionals and opticians I have seen clearly have no interest in helping me. Hoping one day I find an answer on this forum.