Model for chronic pain/chronic fatigue

I love September’s project which I avoided during my 17 years as an Associate Professor guiding students to success in becoming RNs. I’m not looking for sympathy here, but one month after retirement, we were in a car crash leaving me with a fusion of my lower spine. NEVER wanted back surgery. I’ve worked through the thoughts of blame, hatred, and forgiveness. My September project in creating leaner closets (entire house is on warning 😉 ) provided this next idea. Has anyone created a model for chronic pain as it creates chronic fatigue (another potential model), which in turn decreases prolonged mental and physical productivity. I do believe in mind over matter. Thanks. Ann