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This is a bit of a vent so apologies in advance but as someone who has been though the same thing OP has I have heard this suggestion from literally everyone. Even if you do the test and it's test results are accurate it's not 100% clear what to do with that information - it's mostly the same stuff OP would have or did already try.

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It's common to take a 2 week course of something like Xifaxan (an antibiotic that works in the small intestine) after a positive SIBO test, which is not something you can do without a doctor/gastroenterologist prescribing it for you.

-- someone who tested positive for a hydrogen/methane breath test and just finished a 2 week course of Xifaxan

There are ways to get Xifaxan / Rifaximin without a prescription. Plenty of sites where you can buy it online. I got it from my functional medicine doctor who said let's skip the breath test and just try it, because it has very low risk and few side effects.

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