I’ve just had the same problem Songbird.
Bought new pillows from marks, and my necks better. Had the problem for months. Neck pain and headaches. All seem much much better. 👍
My pillows have to be soft, so I’m very picky when it comes to new ones.
So the new ones are a little high for me at the moment, but in time they’ll flatten.
Overall, I’m glad I bought some new ones now.