Requiring upper back middle by shoulder blade. Tight when turning/tilting neck some days are worse than others. This cause headaches? Anxiety related?

Could be. Anxiety can cause muscle tension. Sounds like you may have a muscle spasm near your shoulder blade. It usually resolves on its own, or you could: 1) get it massaged, 2) Lie down on floor on 2 tennis balls, one on either side of your back and each symmetrically next to the shoulder blades, and lie on them for a few minutes or until the spasm relaxes, 3) try heating gel topically.