I do perfect work — why is my body wrecked?

You have spent years training your hands to be exact. You have spent no such years training your body to survive the position that exactness demands. This is not an accident. It is a choice you made without noticing — skill first, structure never. Do not tell yourself the pain is the price of mastery. That is a flattering lie. Plenty of people do precise work for decades without destroying themselves. The difference is not talent. It is whether they treated their body as part of the job, or as something separate from it that would simply endure. What is in your power right now is not the years already spent hunched over a chair. What is in your power is the next hour, and how you hold yourself in it, and whether you finally arrange your days so the work does not consume the body that does it.