u/KiwiApprehensive6506

I got tired of back pain while sitting on a regular chair while working on a computer, so I bought this ergonomic chair with mesh back. Armrests nor headrest cant be adjusted, but with this headrest my neck pain stopped. While adjustable headrest chair were only causing more pain. I mostly feel pain between T9 and L2. My height is 5.3/160cm. I normally spend 10--14 hours a day on a computer.

As per gpt the table was too high, so I lifted chair up and moved myself closer to the table so that my hands dont have to be in upright position to type something. Which reduced pain between T5-T8. I can still replace the chair, but dont believe I will find any better.

Any insights and recommendations will be appreciated.