You may be able to relieve the pain slightly if you change your grip on your computer mouse. Try this - it has actually permitted me to cancel my own ct operation.
Get rid of all pads and supports and mouse mats. Place the mouse on the near edge of the table in front of you. Hold it with half your palm and all of your wrist off the edge of the table/desk. Your palm should be touching the table only from the base of the thumb to the base of the little finger. The wrist will be free of any contact. It may feel awkward at first, but, as I say, this new grip has permitted me to live and sleep without the appalling pain I used to have. I may eventually have to have the operation, since my hand and wrist muscles are quite weak, but at least I am not in agony at the moment.