The most natural solution is to change your diet. Online you can find a ton of free info from ENT Jamie Koufman. She and another ENT, Jonathan Aviv, have books on LPR and recipes. There is a FB group with a lot of recipes based on Aviv's work, I think it's acidwatcher diet warriors. Koufman's page will also give you lifestyle advice, like sleeping with your head elevated. There is also small things like chewing sugarless gum and using the alginate Gaviscon Advance,, UK version., and drinking alkaline water. Switching to a whole food, low-acid diet helps many people with LPR. SIBO also responds to the low FODMAP diet, again available on line. Make a spreadsheet showing what you can eat with those two diets and make plans based on the food that's good for both. I don't know if diet without antibiotics can cure SIBO, but it can help.