Have you had a full vision exam including checking for Prizm needs ? Your eyes may be struggling with convergence. That is when the eyes move to make both images overlap properly.

You can try a test.

Look at the text then cover one eye. Does the text improve or does you eye feel relaxed ? Cover the other eye. A similar situation should exist. If you can read comfortably with one eye closed or covered, it would appear to be a convergence issue.

The visual processing workload on the brain can be intense. Any problems with the eyes make it much worse.

I get eye head aches. When I close my eyes, the head ache is relieved withing a few minutes.

PCS and eyes can be a struggle.

My best to you.