I'm dealing with similar issues. It's obvious I have cervical muscle asymmetry when I frown. As I also have chronic eustachian tube dysfunction, I believe the spasm extents to my up to veli palatini and down through my lungs to my ribs. Overall, my sinuses, neck, esophagus, saliva glands, lymph nodes l, stomach, etc all feel dysfunctional and like the plumbing/drainage is thrown off, resulting in halitosis, dry mouth, gastroparesis, etc.