I haven’t been diagnosed with SIBO, but I’m pretty sure I have it. I just ordered some oil of oregano from Amazon because I’ve read that it’s actually more effective than an antibiotic and much more safe, although you’re supposed to be under a doctor’s care to use it (you just have to be careful if you have kidney trouble and you want to follow the directions). I read a lot about it though and it sounds safe to me as long as it’s used properly. I would say if you were diagnosed with SIBO and you don’t feel any different after the antibiotic, it sounds like you still have it. Did they retest you? Also, antibiotics kill all the bacteria, not just the good ones, so I don’t know if you can tolerate probiotics or yogurt, but maybe that would help? Just some ideas. Good luck!