High sensitivity means the test is good at finding sick people and correctly identifying them as such.
Highly specific means the test can weed out healthy people, or folks with "false positive" results.
Your IgG is borderline. It could be inflammation from something else - there's many different disorders that can slightly elevate IgG - it might even be normal for you.
But then again, your symptoms are strongly suggestive of Celiac and a positive result, even a weak one, on one of the Celiac Panel tests means an endoscope.
Make sure they take at least 6 biopsies - and don't believe them if they tell you they could "tell just by looking" that you don't have Celiac - the damage is often microscopic and can't be seen with the naked eye. (I ended up having to have endoscopy three times in five years because of bumbling docs who didn't know how to properly dx Celiac