My opinion is that many of the common markers of duodenal mucosal injury -the main cause of celiac disease- may have not been detected.
The markers are decreased folds, scalloping folds,
increases vascularity, mosaic mucosal pattern, etc.
Did you have endomysial antibody testing?
Also for histological verification of Celiac's, in order to increase sensitivity, a total of 6 biopsies are required at specific loci .
It is not necessarily an easy diagnosis by any means, therefore, I would recommend you consider accepting an informal clinical diagnosis, based on symptoms and presentation.
In other words, adjust your diet and lifestyle as if you had an official dx of celiac's.
Now, as far as dairy and fructose, you may have what is called cross-reactivity.
Cross-reactivity in food sensitivity occurs when the proteins in one substance are similar to the proteins found in another substance.
It is estimated that 1/2 of the people sensitive to gluten are also sensitive to dairy due to cross-reactivity.
As far as fructose goes, it could be cross-reactivity, or a specific issue with fructose.
Unfortunately the tests you had are far from perfect with too many false positive or false negative results.
Nothing beats the elimination diet results! They are as real as it gets!
Another good test and fairly accurate in my opinion is Dr Coca's Pulse test.
Free download and it can also detect hidden or delayed
reactions. It takes about a week to complete.
It is not an established medical test, because it is... free.
Most free things do not make it into conventional medicine, even if they work, due to the lack of profit
Take charge of your own health matters and your life may improve dramatically.
Doctors working within the limitations and flaws of the profit-driven conventional medical system, may unnecessarily keep you in limbo.
If you have any questions, post again or message me.
Once the underlying inflammation which is causing the damage to the villi is addressed, the villi will start regenerating.