My mother is 79 yo (not a symptom). She was in good health until November. She got a UTI and was given several courses of antibiotics which caused C-Diff. She has been under tx for both and the last two blood tests, stool cultures and urinalysis came back negative. Yet, she won't eat, drink and feels as ill as when she had C-Diff. Still has nausea, diarrhea, no appetite and wants to sleep all of the time. I'm worried it's something more.