Was successfully treated for c diff in aug. doc said to take probiotics for the rest of my life. can i stop if i replace pills with other probiotic?

Yes, however...: I question the need to take probiotics the rest of your life. Once you have re-established healthy flora it should be maintained by a healthy diet (which can include yogurt/sauerkraut & other foods with friendly flora). But I'd be very cautious to take antibiotics only when absolutely essential & be careful in the choice of antibiotics. Take large doses of probiotics during & after antibiotic Rx.