Do some ergonomics research. I used to have a lot of wrist pain from being an auditor and endless spreadsheets. I ended up having to adjust the height of my seat, change the keyboard wrist support and move the mousepad.
Mention your pain to HR. It sounds dumb, but it can help you in a number of ways: that can get you fast tracked for new equipment, it will provide backup if you ever need to call out due to pain and maybe they'd be willing to find an ergonomics class to provide to everyone.