This Celiac.com FAQ on celiac disease will guide you to all of the basic information you will need to know about the disease, its diagnosis, testing methods, a gluten-free diet, etc.
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What are the major symptoms of celiac disease?
Celiac Disease Symptoms
What testing is available for celiac disease?
Celiac Disease Screening
Interpretation of Celiac Disease Blood Test Results
Can I be tested even though I am eating gluten free?
How long must gluten be taken for the serological tests to be meaningful?
The Gluten-Free Diet 101 - A Beginner's Guide to Going Gluten-Free
Is celiac inherited? Should my children be tested?
Ten Facts About Celiac Disease Genetic Testing
Is there a link between celiac and other autoimmune diseases?
Celiac Disease Research: Associated Diseases and Disorders
Is there a list of gluten foods to avoid?
Unsafe Gluten-Free Food List (Unsafe Ingredients)
Is there a list of gluten free foods?
Safe Gluten-Free Food List (Safe Ingredients)
Gluten-Free Alcoholic Beverages
Distilled Spirits (Grain Alcohols) and Vinegar: Are they Gluten-Free?
Where does gluten hide?
Additional Things to Beware of to Maintain a 100% Gluten-Free Diet
What if my doctor won't listen to me?
An Open Letter to Skeptical Health Care Practitioners
That is a fascinating read, should be required reading for any scientist really.
There are a lot of posts on here and elsehwhere from people who were told that they would / had 'grown out' of it. I had asthma from late childhood and was told similar. I 'grew out of it' 30 years later when I changed my diet.
Have your doctors done any vitamin and mineral panels on you? Sores like that can be caused by vitamin deficencies. The B vitamins in particular. You could try supplementing with a stress level B + C combo.
There is a question in my mind as to whether the canker sores are actually caused by your celiac disease. Sounds like the doctors pinned it on celiac disease as there was laboratory evidence proving you were a Celiac. And having canker sores is in fact one of the documented medical conditions associated with celiac disease. But there are many other possible causes.
Have you had follow up lab work and endoscopy to check the response of your celiac disease to gluten free eating?
Antibodies can remain in your system for months to over a year....or go away within two weeks. It sounds like you were advised to go gluten free and that could have caused your TTG to decrease. Does your GI know you had been gluten free?
Some folks with DH have no intestinal or it can be patchy. The antibodies are primarily in the skin. If you know that rash was DH, then you have celiac disease.