I have had the same thing, many doctors, no help then I read
Shift, a Woman's Guide to Transformation - realized i was manifesting many emotions - anger, sorow, grief, abandonment (things I did not think I was feeling) in my neck. I started doing EFT (emotional freedom technique - tapping on the energy meridians) and verbally affirming that I am healing, healthy, without pain and it's going away after 5 years of misery (spasmodic torticollis) I think the left side represents the feminine side and probably your issues have to do with the women in your life - mother, sister, nieces, friends, etc.