Well, since I seem to get my posts removed when I mention book & author, all I can suggest is to go that big on-line book seller's (unamed) site & search "trigger point theapy". There's only two books useful for the non-professional on this subject that I'm aware of.
Pain is funny in that the site of same is not where its actually coming from, so massaging your upper back will not be very useful if the knot you need to dissipate is actually in the muscles of your neck.
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