Eye strain from iMac (Retina 5K, 27-inch, 2020) and iPhone 12

I thought I was going crazy, but after doing a bit of research online it seems like I'm not the only one with severe eye strain from their computer / phone.

For the last 6 months my life has changed dramatically, I have worked as a graphic designer since 2000 and I have never had any eye problems. I don't wear glasses and have been to all the treatments you can imagine, including eye steroids (seriously not fun). So hearing the advise that you must have a health problem and need to see a professionel - it just hurts. I want to cry every day, I can't do my job and I'm seriously considering that I have to change career :(

It all started when I got my new iMac (Retina 5K, 27-inch, 2020) and iPhone 12 just after Christmas. I thought it was all to do with the new office I was sitting in, but it can't be, because after working from home, I still have the same problems.

All I want to know is, which computer can I buy that will not give me eye strain, but can still run all the Adobe programs, that I need for my job??? I love Apple, but if this is the future, then I really don't know what to do!!!!