After 8 years of struggling with this problem, I can tell you what the main causes are for me:
1) Software update: I have lost count of how many times a windows update has destroyed a setup that was perfect for me. Also, the BIOS update can be a cause.
2) Using a “bad device”: a month ago I tried the Nexigo Aurora Pro UST projector which caused me a very bad migraine. For 2/3 weeks every device that did not cause migraine problems had become unusable. The iphone X (IOS 14) destroyed my brain after not even 2 minutes of use, the work laptop as well. I could never use the gaming desktop (13700K + 4070 + W11 23H2) with both eyes but always with “patching.” Well, in those three weeks, even patching no longer worked and was always my lifeline. Fortunately, now I am back to “normal” however I got very scared.
3) There were two cases that I couldn't explain: ipad air 2 (IOS 13) that I have been using for a thousand years suddenly became problematic in my head along with an old plasma TV link with an old fire tv stick. It happened more or less when I installed an FTTH and a new modem. But, I'm sure they didn't upgrade so I don't know how it is possible. Maybe the process of adapting to the work laptop (because for the first month, it was giving me major migraine problems) made me more sensitive to those two devices and less to the laptop itself (now I can work 8h with both eyes, it was the first time that I were able to adapt to a bad device).