Efficacy, and Cost-effectiveness of an Online ACT Intervention for Disorders of Gut-Brain Interaction (iACTforDGBI)

Inclusion Criteria: * Age between 18 and 75 years * Meeting clinical symptom levels for least one DGBI diagnosis (assessed with the Rome IV Diagnostic Questionnaire for Functional Gastrointestinal Disorders in Adults (Palsson et al., 2016)) * Stable medication for psychiatric symptoms including anxiety, depression and sleep problems for at least two months prior to intervention. * Ability to read and write Swedish * Have access to a device (like computer, tablet or smartphone with) with access to the internet and that can be used to attend video conferences and preview the intervention platform (i.e., have a microphone and speakers or headphones). Exclusion Criteria: * Currently undergoing any form of psychological intervention. * Increased risk of suicide (≥4 points on MADRS item 9). * Ongoing or previously diagnosed severe psychiatric disorder, such as schizophrenia spectrum disorders or bipolar disorder.