As someone who suffered with severe IBS due to bacterial imbalance i can say categorically that using more antibiotics to 'cure' it is not right. Pimentel is the supposed leader in this field but his solution is antibiotics followed by drugs for the rest of a person's life. That is not a cure. I am now well, after 18 months of hell. I suggest you read the GAPS diet by natasha mcbride and the body ecology diet, by donna gates. This is how to naturally regain the balance on your gut and heal. I have a long way to go, I will be sticking to the GAPS diet for a year or so to come but I feel 90% well with very few symptoms. I urge you to look for a natural way forward and not a short cut fix like taking more antibiotics. Healing takes time, but once you start, you realize it is a journey worth doing and that it isn't as tough as you thought to cut out certain things.