<<Disclaimer: Verify this information before applying it to your situation.>>

<<<<< My question is, is it likely I am developing intolerance to other
grains? The crumperts contained:

EnerG Rice flour, tapioca flour and potato starch.
Authentic foods bean flour and specialty cornstarch
Xantham gum, egg, vinegar, sugar, salt>>>>>

 The culprit might be the vinegar.   Do you know what it was distilled from?
 Wine, rice, or cider vinegar is ok.   Others might make you sick!