I use Dapsone for my dermatitis herpetiformis. Was not an issue in the beginning of diagnosis. Once I did the covid vaccine it changed and now I cannot stop using the medicine for more than 24 hours or it flares up with a vengeance. Then it takes just over two weeks for the med to get it back under control. My dermatologist was able to identify and treat it, fortunately for me I was her third patient with dermatitis herpetiformis to have a reaction post vaccine. Trial and error with other antibiotics and a ton of steroids prior to this med. Not cheap and can be problematic for liver and pancreas.   

Thanks, Knitty Kitty. No, I'm just taking B12...also a vitamin D3.  For gerd - Pantoprozole. Trents, thanks for the links. There's a lot to digest there (pun intended), I'll have to read those a few times to grasp.

Because of your anemia, you may not be making sufficient antibodies.  I hope they did a total IgA as well as the tTg IgA, and DGP IgG.  I hope you will share the results with us.  If your body isn't making a large amount of antibodies, then the intestinal damage would be less as well.  The antibodies attacking our own cells is what causes the damage. Anemia, diabetes, and thiamine deficiency can cause false negatives on antibody tests.  Have you been checked for nutritional deficiencies besides the ferritin?  Several vitamins and minerals are needed to correct iron deficiency.  Have you been taking any vitamin supplements? Positive on the genes, I see.  Increases the likelihood...  Good job on ramping up on gluten for the test!

Thanks so much for the link and for your thoughts! I have been on a gluten - containing diet and ramped up my intake in the couple of weeks leading up to the endoscopy, so I’m hopeful that the biopsy is painting an accurate picture.    I don’t quite understand what else might be causing the lymphocytosis and the inflammatory cells/ clusters of plasma cells and struggled to get clarity from the specialist. Perhaps this is common and nothing to be concerned about?!   In case relevant, my mother sister are both celiac, and I have the genes: HLA-DQA1*05:01 = Heterozygous HLA-DQB1*02:01 = Heterozygous Thanks again! 

Welcome to the forum, @ellyelly! How much gluten were you eating in the weeks prior to the endoscopy?  Many people with indeterminate results had cut down or eliminated gluten from their diet beforehand.  This can lower the autoimmune response and decrease the symptoms (lower antibody levels,  reduced inflammation and intestinal damage may heal).   If you weren't eating a sufficient amount of gluten per day in a minimum of two weeks prior to the endoscopy, you may want to do another gluten challenge with repeat endoscopy. Here's an article that explains, be sure to read the comments.