A desk setup should serve the person using it. When pain or fatigue changes what feels tolerable, the goal is not to hold one supposedly perfect posture all day. It is to make common tasks easier and give yourself options.
Notice the task that bothers you most
Is the keyboard too far away? Are your feet dangling? Does the screen make you bend your neck? Start with one adjustment using what you already have. A stable foot support or a separate keyboard may help more than replacing the entire desk.
Keep your mouse close, allow your forearms support where comfortable, and place frequently used supplies within easy reach. Make sure improvised supports are stable and do not block ventilation or create a trip hazard.
Build flexibility into the day
Alternate tasks when possible: a short call, a little typing, then a genuine pause. Standing desks are optional and may be unsuitable if standing worsens your symptoms. A setup that looks impressive online is not automatically right for you.
Before buying equipment, consider a workplace assessment, an occupational therapist’s advice, or a returnable trial. Keep notes about what actually changes your comfort. Persistent numbness, weakness, or worsening pain deserves clinical attention. You do not need to solve the entire workspace in an afternoon; one useful adjustment is enough to begin learning what supports you.