A bit OT but regular swimming has done wonders for my back pains. It developed my abs / lumbar belt as well as back and shoulder muscles. The swimming movements (crawl / backstroke) also tend to stretch and generally unkink muscles and vertebrae. When I stretch after swimming, I literally feel my spine popping back into place (I.e., swimming relaxes the relevant muscles enough that I can undo the damages of a sedentary job and carrying a toddler in my arms every day). I don’t know if this would help directly with neck pains but it would definitely improve posture, so probably an indirect positive effect.

Check at first the quality of your chair and the height. https://www.quora.com/What-is-the-standard-office-chair-heig... if you have still the issue contact a doctor.

Handstands!