Hello, Ress. I have also the same experience as you. What I used to do to eliminate the pain is to stand sometime and have a water break while chatting one of my office mates. It straightened my back for a while.
Hi, I had the same experience in my usual office hours, then one of my friends suggests me to explore https://theluxurychairs.com. I bought a chair from this guide and one-year lapses, and I have no problem like back pain or uncomforted.