Consider requesting a fecal transplant for the C Diff problem. I know it sounds gross but when the bowel cant manage its flora, and probiotics aren't working,
It is reasonable to assume a different "approach" may be necessary.
https://www.mayoclinic.org/landing-pages/c-diff-fl?mc_id=google&campaign=1764528857&geo=9011819&kw=fecal%20transplant&ad=381080220642&network=g&sitetarget=&adgroup=72523211407&extension=&target=kwd-18701342647&matchtype=e&device=m&account=2811499158&invsrc=consult&placementsite=florida&gclid=Cj0KCQjwyJn5BRDrARIsADZ9ykGA3fyX4TFkzy0mGMaQ3uAicuYhVxQkWyFJx2GmCutils_0zzhTIQkaApx_EALw_wcB