Hi guys. It's been quite a while since I've been back to this forum. To @degen, @Plsnostrain, and @coach789 , like you guys, I have been unable to find a modern laptop which does not cause a combination of the symptoms mentioned elsewhere (e.g. eyestrain, headache, spaciness, inability to concentrate, etc). It continues to be a source of frustration and discouragement - though I am very grateful to have found an older Lenovo laptop (x140e) which works well with MX LInux 18.3 and XFCE 4.12 (using gtk 2.0). This is an Amd laptop which is not particularly fast, but is okay.
A year or two back, I purchased and returned many laptops and was unable to use any of them for more than 15 or 20 minutes before having symptoms. Continuing past that point could put me out of commission for hours or days.
Anyway, if someone wants a laptop that works well and has a good keyboard, this x140e is recommended. Put in an SSD and a newer network card and it is usable for real work and easy on the eyes.
Good luck and best wishes all. You are not alone with this strange malady.