This older article makes me wonder about the GFCO and its protocols:  

I’ve been using almond flour from nuts.com for over 10 years. I have dermatitis herpetiformis all over. The rash started about two months ago. I finally eliminated the almond flour, labeled certified gluten free, two weeks ago, and I think the dermatitis herpetiformis is finally healing. I am so bummed. 

If you need that designation you'll likely need to switch to a different brand. It's unfortunate that they don't add it to their label and test for gluten.

Thank you for the reply  , I have tried the Baush & Lomb brand and did have a gluten reaction.  O spoke to the mfg and they state the same as many other mfgs.   - NO Gluten intentionally added to product , but they have no control ( they choose not to) over their suppliers of various ingredients  I am really trying to only take vitamins  that clearly state gluten free  

DiGiorno reformulated and have not been using wheat starch for a couple of years now, so this should not be an issue: https://www.goodnes.com/digiorno/products/digiorno-gluten-free-frozen-pepperoni-pizza/ It does contain other ingredients that may be causing you IBS-like issues, for example guar gum.  Many gluten-free foods and baking mixes contain xanthan gum or other gums like guar gum. Although they are both gluten-free, they may cause IBS-type issues in some people with celiac disease or gluten sensitivity: