Fibromyalgia & Diet | Mediterranean vs. Vegan vs. Hypocaloric vs. Low FODMAP vs. Gluten-Free Diets & PROBIOTICS – Possible Treatments? Fibromyalgia is the most common chronic, diffuse musculoskeletal pain syndrome that involves psychiatric, sleep disturbances and other associated symptoms including Raynaud’s phenomenon. In this lesson, we discuss different diets (including probiotic supplementation) that have been examined as possible treatments for fibromyalgia including effects of diet on fibromyalgia pain, sleep disturbances, fatigue, and psychiatric symptoms like anxiety and depression.