Here is a link to a variety of neck traction devices.
I use a pillow called a pillow pedic like this
one. I lay my neck on the pillow while laying on my back with my knees up. Then I straighten my legs so that it creates a gentle tractioning on my neck. The manufacturer actually makes it to work that way.
Unfortunately, it doesn't feel good for me to use it that way. I do love it for sleeping on though because it strongly supports my neck and keeps my head in a straight line with my body. (I'm a side sleeper.) Other similar ones I've tried don't offer the same level of support. We don't travel much or I would buy their travel pillow because I hate to sleep without this pillow.
I also sometimes lay on my back on the floor and put a pool noodle under my neck. That feels really good though I'm not really tractioning; just getting my neck in it's natural curve with the support of the noodle. I'm petite and the diameter of the noodle is kinda small so I don't know if it would work as well on a larger person.
A PT recommended a rolled up towel to do the same thing but it doesn't feel as nice to me but it would be a cheaper option for most people than buying the pillow or the noodle at this point.
Just some ideas.
Also I had Atlas Chiropractic treatment for probably a year or more and his treatments seemed to make my neck muscles around the vertibrae more hypermobile. I should have stopped going to him a lot sooner but they are very good sales people and he had me convinced that no one else could help me.
I've had prolotherapy twice on my neck and jaw which only caused a grown under my skin with no pain relief. It was too expensive and painful a treatment to continue going to him.
I've had 10 sessions of Rolfing which did align my muscles some and helped a bit.
After the Atlas Chiropractic I switched to a traditional chiropractor and have been going to one for years. I do get a lot of relief from pain by going to one.
I also had a year of TMD treatment with a splint and PT on my neck and jaw.
However, unfortunately none of these has helped the ME/CFS much. I do feel a little tiny bit of energy sometimes after going to the Chiro and when I've been experiencing vertigo, his treatment makes it go away right away so I do think the neck issues we have could be part of the package.
I will say though that he is a traditional Chiropractor and is very gentle. Our first traditional chiropractor retired and it was very difficult to find another who did the same techniques. They all seem to have started to use other methods like drop table and actuators which we hate. Those other techniques are just too shocking to the body, at least for us.
I have HHV6 titers but not very high and when Jeff said surgery lowered his titers, I wondered if going to the chiropractor all these years maybe helped my body lower mine. I have no way of knowing though. It's just that going to the chiropractor is the only relief I've gotten from any doctor for any of my symptoms so I don't want to stop but will continue to watch everyone else's progress with the CCI issues.
Edit: Oh, and I have one of the door tractioning devices with the bag that you fill with water. Ouch! Not for me. It seems like I need less tractioning and more of getting my neck to have the natural curves. That's when it seems to feel the best to me.