Hi Sun, I can empathize with you, I have been suffering with the same thing for a few years now. Tense, tight, burning pain in my back, shoulder blades, trapezius muscles, and neck. I know it probably all started because of anxiety, but now I get it before the start of that time of the month. It is sometimes so bad I feel like coming out of my skin or screaming. I have wondered if it is fibromyalgia, but I've never been examined for that, so at this point I have to assume it is tension from anxiety. My doctor gave me the name of a massage therapist, (I haven't gone yet) so massage may give some relief. Pain relieving medicine, heating pad, soaking in a warm tub, resting, relaxing, finding some healthy ways to burn stress like exercise, all these things help.
Take care :)