Reflux is a sign of sibo. Think of it this way, you can have bacterial overgrowth migrate upwards from the large bowel going all the way to your mouth and even effecting your teeth. Don't take any probiotics as you can make the problem much worse. Hubner gastrointestinal gel can help. At first it can make you even more constipated so you need to take laxatives with it at first but once it starts to work it will normalise your stools and make your condition calm down. It won't cure you but it will help but over time the effects will diminish after treatment is finished. The thing is you should only take it for six weeks and then you need to take a break from it. All to often I read glowing reviews on Amazon about silica products but it's just not meant to be taken everyday.
Any advice I give is purely educational and if you are worried then you can always contact a doctor. There are doctors in the health care system who treat people for sibo. However, my understanding is all to often many people treated with Antibiotics have their symptoms return later.