@willtill - I am a Neuro-Muscular Therapist - something in between a massage therapist and a physical therapist. The advise I am going to share is not arm chair coaching.
Many people come to me with issues like you are having - bilateral issues (both hands) usually indicate a cervical issue upstream and in the background.
I would seek out a highly skilled neuro-muscular therapist and let them address the issue through manual muscle and myofascial release techniques, stretching and icing and if all works out - Voila, you wont need surgery.
Most motorcycle riders forget that their hands experience lots of vibration and the flexor muscles (palm side) stay contracted too long which also strains the extensors (back side of hand).
Just learning to stretch properly before, during and after a ride will many times by itself alleviate most of the symptoms. This is double important if you have a job that involves using tools that vibrate etc...
While icing your wrists is uncomfortable in does sedate the nerves and calms down inflamed tissues.
Lastly misdiagnosed carpal tunnel issues are common - yes you may have nerve compression - but you may have the surgery and still be symptomatic if their is also a cervical issue. I work with these types of frustrated folks all the time and when they find out some simple body work and stretching resolved their issues they are both pissed off and overjoyed.
Don't let the surgeon make his new Porsche down payment until you've worked with a great (very talented) Physical therapist or neuro-muscular specialist.
http://www.handtoelbow.com/carpal-tunnel-syndrome/
http://www.advtherapy.net/html/carpaltunnel.pdf
https://www.youtube.com/watch?v=fLR_...ature=youtu.be
Lastly - many folks curl and clench their wrists up while the sleep, you will know if you do this because your wrists will hurt more in the morning - wearing wrist splints at night really helps this.
https://www.youtube.com/watch?v=LTKyioqoZVM
https://www.youtube.com/watch?v=fdD7CgN5FGg