Staycalmsyndrome That sounds like something doable. I will definitely try that and post back the results. Fingers crossed. Thank you.
Laptop/Desktop
Clokwork I think it would be easier to find old GPUs in second hand computers, which can be a good thing as they are usually cheaper.. I will try that.
Lauda89 Reading your answers is giving me some hope! I will try all of those options. Thank you.
JTL I will try it and get back to you all. Hopefully It will work. =)
last good for me: alienware alpha(Nvidia 750) + dell U2414 screen. the U24 dells are the only screens everyone agrees on here.
My setup that works for me is:
GPU: Nvidia Quadro K4200 (these can be found on ebay for around $90 USD)
OS: Linux Mint / Windows 10 20H2.
Monitor: Dell UP2720Q and U2720QTry to use Windows 10 1511 or Windows 7 if you can. Finding a good quality monitor that your eyes agree with is also very important. A lot of people report Nano IPS monitors cause them eyestrain so its probably best to avoid those type of monitors also.
reaganry that’s helpful! Thank you.
Jack thank you!! I will give it a try!
Hello Denise.
Depending on your location and your triggers, my solution may not be helpful.
In my case, I can't find any relief on any LED monitors, whether it's supposedly flicker-free or or full of anti-blue light filters. Therefore, I depend on the refurbished market of old CCFL-backlit monitors. I managed to buy Dell 2209WA, 2009WT, and now I'm even looking for old CCFL 120Hz monitors for gaming, and Dell U2410 for work. Where I live in France, such refurbished market is quite strong, so I have many opportunities to find them. Even old 4:3 screens coming from companies or my friends and family are usable for me. They are not the "sexiest" screens out there but I can't complain, they are perfect for secondary monitors.
With CCFL monitors, I've been able to use W7, W10 with all versions (1809, 1909, latest 2HXX versions), and many Linux OS. I can work and play with them all day long with no issues.
I'm willing to try modern monitors like the ones described in this thread, but I already can't find any new phones and buying and sending them back is already tiring for me. I'll wait for such monitors
- Edited
denise_eca Ah I'm French and Spanish, that's cool 
Indeed, the website I used is also in Spain. I bought the 2009WT on backmarket (https://www.backmarket.es/) for about 80€ with 2 years warranty, like-new. Of course compared to nowadays monitors, it's not a good price, but it was a lifesaver for me at work. There's something cool about backmarket, it's the fact we can send the product back in 30 days if we don't like it : https://help.backmarket.com/hc/es/articles/360031517873-Derecho-de-desistimiento-en-Back-Market-c%C3%B3mo-funciona-
I see many monitors I could PERSONALLY use like these : https://www.backmarket.es/monitor-24-led-wuxga-dell-2407wfpb-segunda-mano/528308.html#l=10
https://www.backmarket.es/monitor-22-lcd-wsxga-dell-e2208wfpt-segunda-mano/21140.html#l=12
Globally, most monitors before LEDs appeared on the market, before 2012.
The second website I use is Leboncoin. It's a website to sell things between people in France, similar to Wallapop used in Spain. I bought my 2209WA for about 45€ on it. It's the one I'm using right now for teleworking.
Hope it helps
Every version of Windows 10 is unusable to me. Windows 7 is pain free for me. Unfortunatly there is no golden rule or guideline, you just need to keep tryig different setups until you find one that works for you
Have you tried patching while using a PC that causes you issues? That has helped several of us
SAH Ah I'm French and Spanish, that's cool
That's cool! We are neighbours. 
Thank you so much for your advice. I know backmarket. I have bought several products from them in the past years. Let's see if I will get lucky. Fingers crossed.
ensete I have been trying eye patching for the past few days. It noticeably reduces the symptoms. I wanted to find out if with both, eye patching and a useable computer, I would be able to work on my screen for longer.