I also tested positive for cdiff but negative for the toxins but my gastroenterologist is still putting me on medicine for cdiff. Had a few rounds of antibiotics and it keeps coming back ( I’ll have relief for a day or two but it keeps coming back. ) I think they send me for spore therapy next. I find if I eat very mild (no coffee, alcohol, eat scrambled eggs, toast, rice, cooked carrots, mashed potatoes,… and eat smaller portions ( also taking visbiome)… I get some relief. I hope your husband can get better.