I used a combination of a wrist rest for my mouse, a wrist guard (which I still wear some days if I am doing far too much computer work - it helps the wrist rest to keep my wrist elevated) and an ergonomic keyboard.

When it is really bad, large quantities of ibuprofen followed by ice baths help immediately to kill the pain so you can then get on with doing something else.

Longer term - playing the guitar really gets the wrist moving properly again, and ensures the blood flow is back up (as that is one of the issues I had - the swelling reduced blood flow to my hand)