Me too around about 1995. My employers health and safety dpt. Provides Ergo Evals.

They did one for me, and while I didn't pay attention to all the recommendations, I did pay attention to the one about the wrist. Pain dose that.

A simple wrist pad in front of the mouse, elevating the wrist, straightening the tendons solved my problem.

It's dorky, they look ridiculous, most of them anyway, but the pain went away. Relief isn't instant, the recovery was slow but it did happen.