I would think that if this is something out of the ordinary for you that it may not be related to your chronic condition. When I get like that I take pro-biotics - a good high strain refrigerated kind from a health food store. Are you running a fever? I would also eat light, easy to digest foods and rest as much as possible. If it is just an intestinal bug or something bad you ate, it should clear up soon. If not, if running a fever and/or your symptoms get worse, check with your doctor. Hope you feel better soon.
