My index finger joint hurts from clicking LMB

Hi,

I wanted to write it here because it's about mouse and hardcore players are here. I used a lot of mice for a week and then it started. The pain is only when clicking LMB. Normally it doesn't hurt. I went to the orthopedist, the film was taken, he said it seems nothing, but when I click on the LMB, the joint part hurts. Has anyone had a similar problem and managed to cure it?

Thanks

https://preview.redd.it/zvzj54tfpogb1.jpg?width=445&format=pjpg&auto=webp&s=a658c10b9f1fbe70d2a77c0ab65f2a7c2f41cc8b