Inclusion Criteria:  • The criteria of bodily stress syndrome, fibromyalgia, chronic fatigue syndrome, or long Covid fulfilled AND  Diagnostic examinations have ruled out the potential somatic reasons for the symptoms AND Disabling symptoms have lasted at least 3 months AND Patient is willing to receive a psychoeducation or brain retraining intervention.  Exclusion Criteria:  • Patients for whom participation could be overly demanding because of physical constraints (for example, patients who cannot write because of dystonia or bedridden patients)  Patients with presence of severe psychiatric and severe somatic disorders, e.g. moderate or severe depression or newly onset cancer for which the study could be overly strenuous.