Hi,
Have you tried a good quality eye drops, you know those, one drop and the eye drops out

. Had to say it!!!
Please I'm not making fun of you, Just looking for something to relax you a bit.
It's a first for me. I truly have never had discomfort to that extend. At times, i get very tired, especially if I do two or more readings a day. I wonder if it might help to just take it very slowly and look at only one card a day, and then also not for very long.
What Rhuto said is true, can it be that you are suffering readers burnout without realising it?
All the best.
Blessed be