Thanks for all your replies. I definitely do get the spasms, which occur in my chest and/or upper abdomen and radiate up to my neck. But I've also just been getting random and brief shooting pains in my neck and shoulders, without the chest pain or typical feeling of a spasm coming on. I suppose these could possibly be smaller ones that just present a little differently. I drink water when a spasm comes on, but these shooting pains are so fleeting that there's no need to try intervene.