If you are on antibiotic then the breath test doesn't work. You have to be off of them for 6 weeks to be tested for SIBO.
Shen put me on Tindamax since xifacin never worked for me in the past. I did 3 courses of it. 14 days on and 14 days off and have been off antibiotics for about 2 months now. I cleaned up my diet big time though.