Had severe flu--suspected bronchitis and strep. Took z-pack. Immediately started to feel better. High fever, chest pain, aches gone. BUT now 1 week after I took z-pack, I have severe abdominal pain and diarrhea after every meal. Can't keep anything from immediately going out the other end. So miserable. I'm thinking the good flora was killed off in my intestines. Calling the doctor tomorrow.