Hi Jack
I really hope you can get back to normal, without resorting to surgery.
Evidently the operation has worked for some – but has left others worse off. Beware!
Please ask locally and Google it heaps.
Do you use the detachable wrist rest?
http://thecoolgadgets.com/wp-content...-trackball.jpg
The Kensington Orbit Optical Trackball Mouse has a “ramp”
http://www.boundlessat.com/Keyboards...rackball-Mouse
Even supporting your wrist with a small wedge of hard foam might minimize strain.
Squeeze Balls:
https://www.amazon.com/Isokinetics-I.../dp/B01FYMV822
Emu Oil:
Perceived as quackery by some – yet others swear by it.
Google “emu oil carpal tunnel syndrome” for more info.
Obvious, but possibly overlooked:
Maximize Keyboard Shortcuts to minimize Mouse usage.
Repetitive Strain Injuries need rest and rehabilitation.