Fibromyalgia and Small Fiber Neuropathy

Who May Qualify: - patients over 18 years of age with no age limit - - having given their signed consent to take part in the study - affiliated to the French social security system - able to be followed for the entire duration of the study - reading and understanding French - accepting the principle of the study and able to comply with its conditions - suffering from chronic pain for at least six months of at least moderate intensity (≥ 4/10) - fibromyalgia detected by the FiRST questionnare and defined by the revised diagnostic criteria of the WHO or chronic nociceptive or nociplastic pain without associated fibromyalgia. - chronic pain for at least 6 months of at least moderate intensity (≥ 4/10) - untreated or with stable analgesic treatment for at least 2 weeks prior to inclusion- normal neurological examination at inclusion Who Should NOT Join This Trial: - litigation or compensation-seeking - cancer for less than 2 years - known cause of small-fiber neuropathy such as diabetes, systemic disease, hypothyroidism, alcohol, renal failure, genetic disease - clinical or EMG neuropathy - peripheral or central nervous system pathology with or without associated neuropathic pain - uncontrolled chronic pathology such as : morbid obesity, sleep apnea, uncontrolled hypertension, etc. - psychosis, previous suicide attempt - drug or psychoactive substance abuse - cognitive or psychological disorders incompatible with compliance with and/or understanding of the protocol - participation in another biomedical research protocol. Always talk to your doctor about whether this trial is right for you.