Hello. I Just Got Through 40 Pills Of Keflex And

Hello. I just got through 40 pills of Keflex and Flagyl for a diverticulitis outbreak. My doctor told me to start taking "Culturell" pro-biotics. I did so yesterday and got horrible stomach pain 3 days after I finished the antibiotics. Same thing happened 2 years ago when I drank Kefir and ate Activia yogurt. Why can I not tolerate "pro-biotics"?????? Thank-you for any reply. Joe