Medicine question. Can oral vancomycin for CDIFF cause kidney stuff like kidney stones or headaches or ear pain? I am on fourth round of it for CDiff

Not absorbed. Oral Vancomycin is not absorbed from the Gi tract, therefore should not cause significant side effects involving other organs. Diarrhea, the main symptom in C diff colitis, will predispose to kidney stones by depriving the kidneys from filtering volume.