Could be Celiac disease. Get tested with blood tests. If positive, right now the only thing to do is go on a strict gluten-free diet.
Do not stop eating gluten until you get tested, but do not delay getting an appointment. Do start adding extra nutrients because it's an absorptive problem. Add a probiotic, vitamin D 2000 IU, calcium 500 mg at night, and magnesium in the morning. Add a multivitamin with iron if blood tests show you are iron deficient. Make sure all supplements are gluten-free so you can take them even after you go gluten-free, if Celiac disease does turn out to be the cause. It's critically important to find out because for Celiacs, eating gluten will cause you to get other autoimmune diseases and even cancer down the road, and it's all avoidable if you completely get gluten out of the diet.
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