I just ordered a ZSA Moonlander in the hopes it will help, because it’s been getting progressively worse for me. I have an Uplift desk (which admittedly I never use in the standing position; it’s just a great desk that I could precisely position), a Steelcase Leap chair, and every other aspect of ergo taken care of. I’ve been to physical therapy repeatedly.
What baffles me the most is that I can spend hours on my laptop, using its built-in keyboard, and be fine. Maybe there is something to the psychosomatic element – I’ve trained myself that my desk equals pain.