Has anyone successfully switched their mouse usage to the non-dominant arm? I've been experimenting with it for the past couple days, and it has been pretty OK - still need my dominant arm when coding, but for general browsing it's pretty reliable. Reason in doing this: my dominant arm is in pain from mouse usage.

You look into ergonomic options? Having your palm face left instead of down does wonders. Also wrist exercises

vertical mouse? yeah, but does it cure the arm pain?

Vertical mouse did the trick for me. Haven’t had any elbow pain since I started using

Yes - I have a lefty and a righty vertical mouse - both plugged in at the same time  - use both simultaneously