Hello WS and welcome!
I am sorry that you are experiencing this trigger...as we all know how much computers are taking more of our time and attention as part of the current lifestyle.
The blue light behind back light devices are known to be a factor in insomnia, as they do interfere with our circadian rhythm...so it makes sense that someone with a system that is sensitive to light could have this anxiety response. Any chance you also deal with migraines or have other neurological triggers?
One easy fix is an amber screen. This is a film that you can buy (some devices like phones and tablets also have an amber light feature in their tools/settings) and place over the screen of your computer/device to cancel out the blue light effect.
The only other suggestions I can make are to break down your computer use into the shortest sessions possible, taking breaks inbetween…
...and to practice daily coping skills for the anxiety.
I hope you can get the answers and relief you seek soon. Post with us anytime for support if you find it helpful.
"Courage is not the abscence of fear, it is feeling afraid and doing it anyway!"
"Worrying does not empty tomorrow of its troubles...it empties today of its strength."
Corrie Ten Boom
Panic Syndrome recovery due to CBT