I have not gone to a doctor, Kadri. But it's getting to a point where that's going to be necessary. It's been a near constant for about 10 months. And gotten worse in the last couple weeks.
Surgery isn't an option, as that will require downtime, and could potentially mess things up in there even worse. It's a long term problem that needs a long term solution.
I think I'll restrict my computer time to just rendering and a few other tasks. I have a Surface Pro, which is similar to a WACOM Cintiq. I've already switched to this device for modelling purposes, so I may have to use it for all other non-rendering tasks, as well. It uses a stylus. It's interesting; I use a mouse with the right hand, but a stylus with the left. And yes, Efflux, you can get it from a stylus, too, but its not as bad.
I'm also looking at one of these:
https://www.youtube.com/watch?v=Fx4o_OrP6xAAnd I think mandatory hourly breaks are going to be necessary, too.
I'm also looking at some tips:
http://ergo.human.cornell.edu/cumousetips.html