I’m have a vitamin D deficiency. I’m still waiting on a qualitative fat test to see if I have malabsorption. 

@jmiller93, Some of us are seronegative and don't test positive on tTg IgA tests.  Anemia, diabetes, and Thiamine deficiency can cause false negatives on Celiac panels.  Have you been checked for nutritional deficiencies?  Iron? Thiamine?  Vitamin B12?  Vitamin D?  Only one Celiac markers is needed to develop the active disease.   I agree a gluten free diet trial is worth a try.

@HWB, Have you been checked for SIBO?  Small Intestinal Bacterial Overgrowth will cause constipation and chemically breath.   The best way to get rid of SIBO is to go on a ketogenic/Paleo diet, like the Autoimmune Protocol Diet.  It starves out the carbohydrate loving bacteria and allows good bacteria to repopulate the small intestine.   The SIBO bacteria can communicate with the brain along the gut-brain axis, making you crave carbs, and in return, the SIBO bacteria can mess with your immune system by lowering inflammation and producing endorphins.  So, it's no wonder you feel better eating sugar.   I took high dose (500-1000 mg/day) Benfotiamine (Thiamine) which promotes intestinal healing and helps keep bacterial in check.  Thiamine and Benfotiamine are safe and nontoxic even in high doses.  High doses (500-1000 mg) every day are required to get results.  The body responds differently to high doses.  Got rid of my SIBO like this.  It was tough, but Celiac makes you stronger.

Try whole milk yogurt.  I eat Stoneyfield vanilla.  Add fruit if you like.  Cultured Pasteurized Organic Whole Milk, Pectin, Vitamin D3. Live Active Cultures S. thermophilus, L. bulgaricus, Bifidobacterium BB-12®, L. acidophilus, L. paracasei and L. rhamnosus. Looking at the NO Fat Greek Yogurt, consider that to give the mouth feel of real yogurt ahd Manufacterers of no fat yogurt add various processed ingrediant that many Celiacs have digestive issues with such as gums.  Consider it processed food.  Fat is an important factor in our appestat to tell us we've eaten enough.  Remove fat and we eat more.  Compared to whole milk yogurt Chobani no fat greek yogurt has a cardboard mouth feel. Chobani no fat greek: Cultured Nonfat Milk, Cane Sugar, Black Cherries, Water, Fruit Pectin, Guar Gum, Natural Flavors, Cherry Juice Concentrate, Locust Bean Gum, Lemon Juice Concentrate. 6 Live and Active Cultures: S. Thermophilus, L. Bulgaricus, L. Acidophilus, Bifidus, L. Casei, and L. Rhamnosus Funny that since recommending low fat diets in the 1970's the US population has gone from 15% to 50% obese.

Just had my daughter diagnosed and am currently awaiting blood test results for my son. As well as many bowel issues, mostly loose stools with mucus and lots of gassy moments sometimes leading to leaning stool, he has recently soiled himself in his sleep twice. He has been toilet trained for a long time, but is not waking up with the poo. It’s not just a little, it’s a lot.    We have had to make an appointment re his blood test results next week so will find out if it is coeliac too but I’m just wondering whether anyone else has had this? Ive read online that it could mean he’s constipated, but he poos all the time and it’s often soft, never hard.