I used to have chronic neck pain and used to go to TCM to get my neck cracked and massaged but to no avail.
At the same time, I accidentally stumbled upon mewing (youtube: Should Tongue Rest/ Touch at the Palate/ Maxilla/ Roof of the Mouth By Dr Mike Mew) which is the proper way of resting your tongue on the roof of your mouth. After learning mewing, my neck pain miraculously disappeared.
like I'm sure it'll be different for every one but it really worked for me! anyway, to engage in mewing, you have to force your body to maintain a proper upright position most of your waking time and it is a huge effort but it is damn worth it.
there's no harm trying, just need a lot of effort to do mewing properly, hope this helps!