I saw a nutricianist who also is diagnosed with Fibromyalgia
. She recommends removing all simple carbs from the diet
ie. sugar, wheat, white rice, potatoes etc (and dried fruits to begin with). You can eat other complex carbs eg. oats, rye, quinoa, millet etc etc. (I did find out I have a gluten intolerance, which may/may not be relevant to you and I also have a dairy intolerance, but usually that is not the case).