I was diagnosed with excessive diarrhoea 2 weeks ago and it persists, as well as weight loss. experiencing extremely bad stomach cramps; loose stool?

2 weeks: Two weeks is too much for the diarrhea. You should be seen. Highly likely you have and infection.

Long d/d: Clues for organic disease are weight loss, diarrhea that wakes you up at night, or blood in the stools. These are signs that your doctor will want to do a thorough evaluation to determine the cause of your symptoms. Also tell your doctor if you have a family history of celiac disease, inflammatory bowel disease (IBD), have unintentional weight loss, fever, abdominal cramping or decreased appetite