Discussion: A dietitian is treating me, but without much success. I do not know where to start?

I recommend you consult a qualified naturopath, especially in the early stages of dietary and lifestyle changes. The article in the attached link may help you.

Fibromyalgia manifests multiple chronic inflammations spread in various body systems, making it difficult to diagnose and treat. CFS is essentially painless Fibromyalgia! Fibromyalgia patients are often treated with the misconception that it is an incurable disease! Treatments accordingly are only symptomatic and do not attempt to bring about the patient's recovery. Fibromyalgia is a chronic inflammatory disease. The main difficulty in analyzing which type of chronic disease is Fibromyalgia stems from various symptoms in several organs/systems.

Link: Fibromyalgia and Chronic Metabolic Fatigue.
https://www.sf-healing.com/page/124 (Copy & Paste)