I stopped using it a month ago, after having a pain in my thumb that was there constantly and I never had. Now, it does not hurt anymore. I do have the mx ergo

I stopped using it a month ago, after having a pain in my thumb that was there constantly and I never had. Now, it does not hurt anymore. I do have the mx ergo plus. I never had any problem with any mouse, it is the fact that I need to move the thumb so much. Also I might have a job which is more intensive in mouse than most people coding. Or perhaps is that the "celtic hand" runs in my family and it is not good to use. I am afraid I will have to sell it, which I don´t particularly like because it costed me quite a lot.