Like I mentioned before, you need to get a BS filter in place. Fear is normal when having a new disease, especially like UC when it's easily thought that food will control everything.
The detox wouldn't have caused your UC, but what symptoms were you having before seeing the toxicologist?
Oh, and I forgot to add....you might have had leaky gut syndrome of the colon because of inflammation......some permiability of larger molecules of gluten type foods may have caused you some reaction. But that doesn't mean you necessarily have an allergy to gluten. It means that you had a not normal reaction to something that was foreign.
As you heal, the leaky gut should go away as would your reactions.
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