I now have (no money) a 3060ti and a 2060 to test. They are both largely the same, I feel the 2060 doesnt affect me as much as the 3060ti however it is still significant.
Everything is the same, only difference is GPU. I reinstalled drivers same version but same issue.
Initially on day 1 with 2060 I could feel it hurt my eyes, they felt sore initially, this pain slowly got worse then I feel from my head, I can feel pain inside my head, it gest worse, pressure pain, I feel disorentated, my head feels heavy and there is significant pressure pain. Eye drops help my eye issues as it feels my eye gets very dry.
I test monitor output (IPS and TN tested PWM free no flicker) on full and limited RGB, full is slightly brighter when using a light meter app, I get symptoms on either setting though but testing on limited as it slightly dims the color intensity
This 'migraine' continues for several hours after stopping use of the machine, into the next day. Exposure for only a few minutes is enough to cause symptoms.
I use my 1660super though, everything is ok, no issues at all.
My last resort is to try another monitor, I do not own a VA monitor so I'll try to get one of those.