The current study aims to focus on the neural mechanism and brain-guided therapy of Fibromyalgia (FM); a chronic pain syndrome. Despite intense investigations, the pathophysiology of fibromyalgia remains elusive. Several studies demonstrated that morphological and functional changes in the central nervous system may play an important role in FM development and progression. The unknown etiopathology of FM contributed greatly to the absence of mechanism-specific cures. The insufficient treatment for FM, along with the understanding that CNS abnormality constitutes a major factor in FM pathophysiology, emphasizes the need for mechanism-based therapeutic intervention and opens the door for advanced neuromodulation techniques. Guided by this approach, the investigators aspired to establish a multi-function model with the potential to exert neuromodulation effects. To address this goal, the investigators employ a method previously developed for the construction of an fMRI-enriched EEG model ("EEG-Finger-Print", EFP). In this approach, EEG is used to predict specific brain activity, as measured by fMRI in a given region. Our main objective is to explore the neural mechanisms that underlie limbic neuromodulation and to gain a profound understanding of the functional processes that can potentially modify deficient functions in FM. The investigators intend to conduct two studies. In the first study, the investigators focus on the previously developed EFP model that selectively targets the amygdala BOLD activation (Amyg-EFP). The investigators aspired to investigate Amyg-EFP-NF effects on chronic pain in FM. To do so, the investigators conducted simultaneous recordings of EEG and fMRI during Amyg-EFP NF training on patients with FM. The main research objective of this study is to demonstrate target engagement following Amyg-EFP-NF training in FM patients. In the second study, the investigators aim to conduct a randomized clinical trial to examine the causal effect of the Amyg-EFP on patients with FM and to explore the clinical effect of this model on a wide range of symptoms related to FM. To examine the neural, clinical, and behavioral specific effects of the EFP-NF training, the investigators will implement a comprehensive clinical assessment. Furthermore, the investigators will conduct an MRI/fMRI scan before and after the EFP-NF trial, in order to explore the neural modification effects. Clinical follow-up will be conducted after 10-12 months from the post-intervention evaluation. The investigators will compare the neural, clinical, and behavioral effects between three groups. I. Amyg-EFP-NF group: a multisession NF trial using feedback driven by the Amyg-EFP model. II. Control group I- sham-NF: a multisession NF trial using sham feedback. III. Control group II: patients in this group will continue their usual treatment without any intervention. The investigators hypothesize that patients in the Amyg -EFP-NF group will exhibit wider and more robust changes in neural and behavioral outcomes associated with the wide range of symptoms related to FM. This study can significantly advance the understanding of the neural processes that mediate modification of somatic-affective functions in patients with FM and, therefore, enable the establishment of better treatment prediction and possibly more personalized procedures in future studies.