While I agree sharing is helpful, I have to say it occurs to me that, given that folks like us seem to have a wealth of information and have done multiple/various treatments already, it's not clear what we need is more info :).

I read your comment from August 23 and you mentioned stress being a factor; I can tell you 100% that is, for sure, a very significant factor and it was most likely one of the reasons I got SIBO to begin with. Typically, when you're highly stressed, your system shifts into the sympathetic state; among the fallout, your digestion slows down (or even shuts down) - impaired motility is a root cause of SIBO. Further, your cortisol rises dramatically which among other things, blunts serotonin, tryptophan it's precursor, and GABA - all calming neurotransmitters and notably, the gut is a major site for their production.

My own "stress response" was compromised from childhood trauma and then working in high-stress environments. Since retirement, I'm generally calmer (although I have my moments) and I've become painfully aware (as it seems you have) of the long-term effects on my body. I've taken steps to address it directly (supplements to reduce cortisol, meditation, gentle exercise). A couple of practitioners over the years (ND and Functional Nutritionist) put the same emphasis on this as they did the diet and supplements for SIBO. Some key natural supplements that help are 5-HTP (serotonin precursor), GABA, and theanine. They do work but alas, not like a benzo Rx does (instantly); it's more of a shift in your system over time but indeed much better for your body as you're directly supporting what it needs (whereas benzos are very addicting and don't address the root cause).

Another thing that I believe is sorely need to overcome SIBO (especially SIBO-C) - and something that I have not done myself, despite the suffering many years - is to treat it long-term with consistency. Someone else on this thread mentioned being on antibiotics/antimicrobials for at least 2 months, then addressing motility, etc. and she managed to get somewhere. Further...

As I mentioned in another reply of mine, addressing the microbiome at the appropriate time with the approprite substances (prebiotics and probiotics) is another key element that has become more prominient over the last several years. Check out the work of Dr Jason Hawrelak if you have not already: https://www.probioticadvisor.com/about-us/dr-jason-hawrelak/