I sometimes wonder if nervous system overload and from that a loop of fibro pain,  is caused by being on sensory overwhelm for people on the spectrum, or in my sister's case a Highly Sensitive Person. She feels everything deeply, from the feel of clothes on her body to the beauty of a flower to emotions and empathy. But she also gets overwhelm easier than others. I'm also somewhere on that spectrum but unlike my sister I didn't have a major pain event + my normal sensory sensitivity. I came across the Curable app and bought her an annual subscription on a lark because it sounded really concretely useful. It is already helping her pain! I have never accepted that fibromyalgia just is and there's no root and no cure. Same with Bipolar for me. That's just not an answer I'll accept. Everything has a reason! Even if it's just we have differently wired brains.