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Such symptoms, are indicative of underlying medical condition, and have to be thoroughly evaluated by doctor.
You need to get a stool samples for microscopy test, it would check for ova/cysts of parasites.
Also stool sample should be checked for its fat content, It is positive in malabsoprtion syndrome like chronic pancreatitis, bacterial overgrowth and inflammatory bowel disease.
Also you need to go for Upper GI endoscopy, it helps to visualize the upper part of the gut, and to take biopsy sample from the intestine (to check for coeliac disease).
Another test, called Anti TTG (Tissue Transglutaminase Antibodies) is also indicative of coelic disease.
If you have Parasitic infections/ bacterial overgrowth, then you would need antibiotics. Coeliac disease is managed by gluten free diet.
You should avoid processed foods. These may contain 'resistant starch' which is difficult for your body to digest.You should Cut down on foods rich in insoluble fiber, such as wholemeal bread, wholegrain rice and cereals containing bran.You should avoid foods such as beans, cabbage, or uncooked cauliflower or broccoli.
I would suggest, that you should have detailed discussion with Gastroenterologist for tests, and get this issue managed.
Hope this helped
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