Hi, Welcome to Health care magic forum.
As you describe, it appears to be the celiac disease
, due to intolerance to the gluten,in wheat,barley,oats etc.
It also may be due to the lactose intolerance
due to the presence of milk and milk products.
I advise you to consult a gastroenterologist
for diagnosis and treatment. You may need to have colonoscopy
, and biopsy
Wishing for a quick and complete recovery. Thank you.