Some doctors believe the breath test is reliable but the clinical literature suggests that it is not. There is a high degree of false positives and false negatives (20 to 40 percent in different trials). You can have it but why spend the money and time if you already know you respond to an AB? There is NO 100 percent proof of having SIBO. You can have the breath test and if it is positive, you will be on antibiotics which may or may not help and no professional knows which AB is best nor for how long. Many diseases are this way. Diagnosis is based on a combination of symptoms, ruling out more serious issues through biopsies/lab/pathology, response to therapy, observation and the clinicians' experiences. My latest GI doctor believes in long term AB treatment up to 3 to 6 months to kill the bad bacteria that has infiltrated the small bowel along with (believe it or not) a laxative or colon cleanse to clean out the bacteria. (This is why many of us with SIBO have felt better after a colon prep.) I have also learned to avoid the proton pump inhibitors and antacids because they make SIBO worse as do most dairy food. There is a recent peer reviewed article regarding the PPi's and how they made a population with SIBO worse. We need our stomach acid to kill the bacteria in the SB. Also, probotics and prebotics are controversial. They tend to make me worse or do nothing at all. I took Tetracyline for 6 months 2000 mg a day and have also gone on an organic diet which has made me feel much better. Much of what I have done/did was my decision along with the expert opinions of my doctors and literature. I think we all need to be OUR own best advocates. You/we will be hard pressed to find ONE doctor or ONE perfect therapy to help you/us. Also keep in mind that one in four people cannot tolerate dairy food. I suffer with gas, bloating and diarrhea anytime I eat yogurt, cheese, milk, cream, (dairy), casin, cassinate (in packaged foods), or whey. There are others here that swear they got better taking Kilfur (sp?) or Align both of which are dairy related products. Each of us and our systems are unique. What works for one is not going to work for another. This does not mean there is no cure, nor no hope or treatment. Do not give up but be systematic in your detection. You may want to keep a notebook of all that you have tried, eaten, taken and the result. Do not make changes too quickly. I think three weeks is reasonable to see if a product/therapy or dietary treatment may be working or hurting. You have to follow your instincts as to what you think is best for you. Good luck.