Sounds like you are address symptoms of the issue, but not the cause which is why it keeps returning.
Have you looked at anything downstream of the neck?
Traps, t- spine, shoulders?
These may be contributing factors.
Jill Miller has some quick fixes here
A link for a free quick fix others are available for a small fee.
The stress relief, neck,shoulders, upper back may be helpful.
Hitting a problem from multiple avenues may be the key.