My doctor ran the tTG-IgA test blood test for celiac disease as I have been getting joint pain which isn't explained by the usual blood tests for arthritis (I am 54). Prior to this I had largely cut gluten out of my diet as eating bread, pasta etc. makes me feel 'blah' (bloated, lethargic, brain fog). The first tTG-IgA test came back equivocal, so since I...