After 20 years of visual issues following a concussion, I ended up doing Visual Therapy and it’s making a huge difference. It turned out that I had a number of vision processing issues post-concussion (convergence problems, visual memory issues, and peripheral vision problems) that were making my brain work really hard and exhausting my energy. I’m now at the point that I can take a long walk outside without being nauseous due to all the movement in my peripheral vision, and I’m working now to be able to use the peripheral vision while I’m focusing one something as well. It’s hard enough to process things when you have inattentive ADHD (like me) without adding all the extra processing that the vision issues required. I highly recommend looking into Vision Therapy, given the symptoms you describe.