occasionally, my neck muscles go into spasm - it is very painful and the only treatment has been with a strong muscle relaxant and/or a chiropractic adjustment manouvre (where they basically snap' the muscle out of spasm by twisting. It is now Saturday - the chemists are shut and my neck is about to go into full spasm - I have been trying heat pad, heat rub and massage pads for the last couple of hours but the hurting is getting worse and movement more restricted - advice please (had thought approximately A but past experience for similar was that they left me flat on a trolley all night - 1 dose of diazepam 5mg and then told me I could go at about 6am)
Sounds like you have a trapped nerve.
A visit to a therapist should sort you out in no time.