You may want to check out some book concerning yeast.
Especially for your Fibromyalgia.
One is called "The Yeast Connection"
I do not have MS, but my dear daughter-in-law does.
I have Bipolar Disorder.
I have been suspecting for some time now, that some 'foods' may be contributing to many of the illnesses our population is suffering from. At the very least some foods are simply exacerbating symptoms, or making things worse.