Usually it is a good idea to be retested for the SIBO after antibiotic treatment because sometimes you don't get the right one and you may need a different one. They can't always get the right one the first time in all people.Also if your diarrhea is more severe than usual, you may need to have a stool test for C. diff.Regardless, it sounds like you need a follow up appointment ASAP or at least a call into the doctor if you have a follow up scheduled but it isn't soon.