I went to the emergency room for diarrhea and vomitting. They gave me ciprofloxacin for an antibiotic and I had never taken it before. When I took the 3rd dose (500mg per dose), I had the worst diarrhea ever so I decided to stop the antibiotics. At the 7 day, my diarrhea returned and I took ultra carbon but it didn't work. So far, I had never taken any probiotics. Any advice?