It took me a long time to wrap my brain around the effect long term stress anxiety was creating in my muscles, nerves, bones, and immune system.
The first step was to separate the pain levels, origin, and length of pain. By the time I got some relief, I was diagnosed with fibromyalgia, myofascial pain, had a bout of shingles, and am in CBT (cognitive behavior therapy) to help me move past the "stuck" reactions in certain processes.
Three things I would do to help figure out where the "real" pain is coming from. First, use a stick drawing to help you see the way the pain is moving. Second, check your posture, balance, and when your pain level moves, observe your posture and balance as it is, right then. Third, decide what you want the pain to do-how do you want it to leave you (I know, it sounds strange, however, with anxiety, physical movement will make the anxiety part of the physical symptoms disappear naturally, leaving you with the aches, tensed muscles, etc).
Best wishes. You have taken the important first step to helping reduce the pain. You are not alone.

Yes, I have two anxiety disorders that are considered chonic. My anxiety caused me to develop GERD or Acid Reflux disease. I also take anywhere from twenty to forty milligrams of Flexril a day for my muscles. It's unusual that none of those treatments have helped you. But yes, anxiety can cause a lot of physical problems including even heart problems at their worst. You never mentioned whether you were on any medication for your anxiety. If not, I definitely encourage it as you'll be very surprised at all the physical problems anxiety can cause. It caused Acid Reflux Disease in me. It can cause high blood pressure in the long term if Anxiety goes untreated.