Hello, I am also new here, so I won't be able to answer some of your questions, but I can tell you that I also have chronic pain. I have pain in my joints as well as a deep ache type pain in my muscles that feels something like body aches from the flu. I have been diagnosed with Fibromyalgia and I have POTS. Sometimes I wonder if it is the POTS causing the pain...especially the pain in my legs and feet. Hope you find some answers here! Take care, Ann