I went through that rodeo, I've bought a Wacom tablet, built an ergonomic desk (the height of the desk and monitor were for me key), bought a good chair (Steelcase Please), and went first to physiotherapy.

After getting through the first hurdle of stopping the pain, my Doctor sent me to the gym. His words were: "You need to prepare your body for your activity just like an athlete does". Getting stronger and fitter helped me a lot. That was 8 years ago.

That worked for me, naturally your mileage may vary. I hope you get well soon.

Cheers, Leonardo