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? - list blood tests, endo with biopsy, genetic test and enterolab (not diagnostic)
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
Where can I buy gluten-free stuff?
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I will say what everyone else says and get tested again with the endoscope and biopsy to confirm, you will need to be on gluten for 12 weeks for blood test 2 weeks for endoscope at least a slice of bead a day.
The thing about celiac is many symptoms can be quite minor, hell even before I had my MAJOR symptoms show I had some of the other issues show up in my every day life and I just thought it was normal. Regardless if you keep eating gluten with celiac disease it will slowly eat away at your body internally til it does become a problem. Celiac is a autoimmune disease that reacts to the gluten proteins, and has misdirected attacks on your own body internally by mistake trying to kill the gluten. Now the damage can lead to all kinds of other auto immune diseases, random allergies, food intolerance, and even cancer.
I suggest if you do have it, stay on the gluten-free diet, your just basically changing brands there are many gluten-free food versions of everything now days. Be thankful you got this early, I developed issues with dairy, corn, peanuts, and a whole list of others along with another autoimmune disease Ulcerative Colitis that makes it so I can not eat sugars or carbs or my intestines swell. Getting on a gluten-free diet before your damage progresses will not only keep you healthier for longer, and let you live a pretty normal life but also save you from this pain and very limited diet if the damage progresses too much.
As to your fatigue, you changed over to gluten-free diet, you stopped eating a bunch of the Fortified foods, and depending on the route you took of either whole foods ore more processed foods. You could be eating to many empty carbs, starches, and not enough nutrients. OR if you took the whole foods approach you be lacking in your daily calorie intake or not the right ratio of nutrients. You might have to supplement a few of them.
REALLY odd call out here, I am attending a anime convention called A-Fest in Dallas come August, I need someone to split the room with it who is gluten-free. I take extra precautions, I COOK all the food, bring only CERTIFIED foods into the room, The room will be Gluten Free, Corn Free, Dairy Free, Peanut Free. I am trying to find someone to split the room cost with, that would be safe to be around I CAN NOT AFFORD to get sick at one of these things, it is one of my few joys left in life and get very paranoid around them. So I need someone who is also gluten-free to make sure the room stays safe (YES I have done with with a non celiac with the rules down and well stuff happens so not chancing it). Room split is food coverage comes to $400 if it is just two people. 4 day convention, I will arrange a meal plan around your diet as long as it is free of my allergens. I will also provide various snacks, baked goods, and even stuff to take home with you.
This thread might have some information that would help you. Your doctors are pretty lame IMHO. Perhaps you can find a celiac group in your area that has local meetings for support. They might also suggest a different doctor who knows how to treat celiac patients.
All the above posts are full of good advice. What I'd like to add is, if you have coeliac disease and continue to eat gluten, you run the risk of other autoimmune diseases in the future as well as osteoporosis, malnutrition and even cancer, so even if you had no symptoms at the beginning, and may also not have any symptoms if you eat gluten (not all coeliacs do), the damage is still being done to your gut and the rest of your body, so please be aware of this.