I was prescribed rifaximin for my heartburn and digestive issues. Problem was when I got off it, the symptoms returned. After 3 endoscopies, and also put on a Proton Pump Inhibitor each time, the GI doctor told me to never take a Proton Pump Inhibitor again - it was the same issue, once off of it, the symptoms returned.
That's when I changed course and sought out a functional medicine doctor who tested me for multiple causes for my SIBO as well as running other tests. The difference with a functional medicine doctor is that they look for the causes of your symptoms - looking for the cause and treating it also treats the symptoms. Same with osteopaths or naturopaths. They look at things differently than traditional medical doctors.
Here's the website to find one a functional medicine doctor in your city and state: ifm.org. You can see what their specialties are. It is well worth the cost of having a doctor who looks for the CAUSES.