I would go to a GI that specializes in celiac disease.
Your endoscopy sounds like damage from celiac disease...do you have the pathology report along with the procedural report?
The most telling piece of information is your improvement gluten-free.
Also of interest is a Total IgA is low...just not out of range which could mean the IgA blood work is of no use. Have you had a tTG-IgG? or and AGA-IgG -- I do see you have a positive DGP-IgG.
Here is a simple explanation of the Marsh Scale for Celiac Disease...note Stage 1 and 2 are not specific to celiac disease...yet damage plus positive DGP-IgG plus familial history plus dietary response seems like Celiac to me:
Here is a basic explanation of the Marsh Scale used to type Celiac Disease.
Stage 1, the cells on the surface of the intestinal lining (the epithelial cells) have more lymphocytes (white blood cells) among them than normal - Stage one is not specific to Celiac Disease.
Stage 2, the changes of Stage 1 are present (increased lymphocytes), and the crypts are larger than normal.
Stage 3, the changes of Stage 2 are present (increased lymphocytes and larger-than-normal crypts), and the villi are shrinking and flattening (atrophy). There are three levels of Stage 3:
3A--Partial villous atrophy
3B--Subtotal villous atrophy
3C--Total villous atrophy
Stage 4, the villi are totally atrophied (completely flattened) and the crypts are now shrunken, too.
PS...there are many gluten-free beers available.