Loose watery stools. blackish green in color. urge to have a bowel movement all the time. stomach cramps. nauseous. could it be c-diff?

Possible: It could be..But the stool with cdiff should be water period. In the hospitals, a formed stool will not even be processed. You need to have your doctor order a stool for cdiff toxin a/b, ova and parasites and culture. Otherorganisms such as campylobacter, yersinia, salmonella and shigella may also cause such symptoms. The green stool would fit cdiff as well. In the meantime, eat yogurt daily.