I am sorry that you are troubled with maldigestion / malabsorption. You need to get your stools tested for parasites to exclude infestation as a first line investigation. From your description, I form the impression that your pancreas is not producing adequate enzymes, a condition called chronic pancreatitis and you need to get investigated for this by a gastroenterologist. This will include ERCP (endoscopy of the pancreas & bile duct) and some scans. Finally, you may require investigation for coeliac disease (jejunal biopsy). Good luck!