Hi Eloise,
I had both the stiff neck and shoulder pain for several years but it was very obvious that they resulted from my TMJ. I initially had pain directly in the jaw joint and couldn't open my mouth. It wasn't until about 7 years later or so that my neck started hurting and then followed by my left shoulder. It too felt (and sometimes still does) that I have a pinched nerve. Do you have any other symptoms of TMJ such as headaches, earaches, popping noise while eating, etc.? I know almost nothing about shingles, but have read that people with TMJ have been known to develop shingles sometime in their life. I can't remember why tho.
Since you live in the UK, I know that the medical field is different than here in the USA. Are there people who practice cranial sacral massage therapy or something similar? I discovered a CS-MT two years ago and she finally broke up the constant shoulder pain I had been experiencing for years. I would suggest trying one even if you have to pay for it out of your own pocket (I did).
I wish I could help more. Dyan - what is an orthoganist? Is that similar to a chiropractor?
Take care of yourself Eloise.
God bless...
Carol