ABSTRACT Classical rheumatology and pain management paradigms rely fundamentally on the detection of mechanical hardware damage, such as tissue inflammation or nerve degradation. Consequently, conditions like Fibromyalgia, which present severe chronic pain without corresponding local structural anomalies, remain medical enigmas. Under the HEPOE Theory (High Entropy Predictive Organization Efficiency), we propose a radical shift: Fibromyalgia is not a musculoskeletal pathology, but a systemic collapse of the somatosensory predictive algorithm. We define this condition as a failure in the internal Closed Gating mechanism, quantified by the loss of the Sensory Attenuation Coefficient. Instead of deflecting the baseline structural entropy of normal biological functions, the system assigns abnormally high "Precision Weighting" to basal metabolic friction. This relentless decoding of benign internal noise as high-entropy tissue damage leads to a catastrophic depletion of ATP, resulting in continuous systemic pain, profound physical fatigue, and the cognitive suppression known as Fibro Fog, formally modeled here as cortical Thermal Throttling. Keywords: HEPOE Theory. Sentinel Phenotype. Fibromyalgia. Chronic Pain. Somatosensory Entropy. Closed Gating Mechanism. Thermal Throttling. Endogenous Hyperalgesia. Predictive Solvency. Landauer's Principle.