Any new medication can be hard on your stomach but nausea and diarrhea usually level off and are not to the extreme you’ve described. When she was discharged from hospital what did the attending physician and nurses recommend? And is she still having severe diarrhea . . .? They did do a thorough investigation. Whomever ordered the tests must expect to see her again for follow-up; if you are in doubt give her doctor or the hospital a call and ask what you should do next. You are right to be concerned. If she has not improved she runs the risk of getting dehydrated. Insist on getting help. Push fluids in the mean time. Good luck. Guy