Try Baclofen - it’s a non-narcotic muscle relaxer that helps your muscles un-tense, helps you realize when you ARE tensing, and can help with anxiety in general. It doesn’t work for a lot of people, but it’s been a miracle for me (shoulders and neck so tense from PTSD I pulled my SPINE out of alignment)

Someone else posted this, but it’s a great read. Many links to studies, answers to questions, etc. (I’ve always been pro-choice and even I was surprised by some of the information here.)