Right, sounds like you are pretty much there and probably have enough grounding with family history to push for testing, just so happens it was a topic I was looking at today, below is a reasonably current testing protocol for gluten sensitivities.
https://www.cyrexlabs.com/Portals/0/...lAppArray3.pdf

Worth having a good read through and then searching out some of the things discussed, it is written as guideline for clinicians, when you read through you will realise why I called it the iceberg, there are multiple stages from Coeliac (CD), atypical CD, gluten sensitivity ab positive and sensitivity antibody negative.

Most data to date has focussed on gliadin and particular fractions, but it seems that many other proteins in the wheat also ilicit antibody responses, but they haven't tested for those antibodies in the past, hence the ab negative sensitivity.

Good luck with it.