A fellow rider who I did Chico with has also had a lot of GI stuff since then,and my assistant has called in sick with it for the second day now, so there does seem to be something; I have chronic food allergies, so I am not sure I could tell whether it was out of the ordinary or not for me. I had chronic 1-2 day 'stuff' for a while, and added some extra B vitamins to my normal supplements, which seems to have helped. When it hits, I try not to 'fight' it and just allow myself to rest and do nothing.