Not sure for you but I know what gets me in those type of items so I'll just tell you that.
I've been feeling sick lately- some loose stools and feeling so queasy. But I absolutely cannot figure out what could possibly be making me feel this way. The only new things I've eaten lately are wal-mart's extra virgin olive oil, Americolor food coloring (I called the company and they told me it's gluten-free), a new Spring Valley vitamin (labeled gluten-free), King Arthur gluten-free chocolate cake mix. I'm stumped. Just curious as to whether any of these products are labeled gluten-free but actually contain trace amounts and anyone else has reacted to them.
Walmarts olive oil may not be 100% olive oil, which means it can have vegetable oil in it, wheat
Vitamins can have msg type products in them that make me have the reactions you described. I have started getting mine from Life Extensions
Gluten free cake mix probably has xanthian gum in it which can cause loose stools, is made from the bacteria that causes brocoli and caulif. to get that black slimy stuff on it.
Not sure about the food coloring but anyway check out those things. I am extremely sensitive to any msg type product so you may want to go to the truth in labeling website and read up about that and see if you are as well. Unfortunately xanthian gum is in so many things so it makes your choices a lot less open but if it makes you sick you don't want to be eating it. In dairy they use carageenan a lot and that makes me sick as well.