Postive for SIBO, worried a out crashing

Gastroenterologist tested my postive for SIBO and IMO, methane and hydrogen dysbiosis, and gave me one round of antibiotics. Ive seen people crash on these and i know with my luck ill crash too. Maybe not, but the risk is there.

I got the meds a few months ago and still have not taken them. Ive also canceled my future appointments because there is no point in follow up.

I've seen people on r/sibo go multiple round with no progress. So, obviously that's not an ideal situation for someone who is sensitive to drugs. I can go herbal but is there a pill that be minimize a crash or die off symptoms? Herbal is "lighter" but even that have side effects that lead to crashes.

From what I researched diet change like low carb or FODMAP diet and lowers SIBO measurements. Then herbal pills maybe mixing to prevent bacteria getting resistance.

It it worth the risk.. what's the best way to go about this. This could be a step in the right direction. I have a b12 deficiency and fixing this could trigger a chain of postive events.

Any sage advice?