SIBO+Collagenous Colitis+EPI

So I have apparently hit the trifecta: Diagnosed with Collagenous Colitis and EPI in October, 2023 (along with Essential Thrombocytosis but that isn't pertinent to this question. . . ). Lately I have had gas and distention and was just diagnosed with SIBO. My methane levels were just over the acceptable limit and normalized during the course of the breath test. My question is: have any of you managed SIBO without resorting to antibiotics and if so, how? I would prefer to do this through diet if possible. I suspect a FODMAP issue as onions and fibrous veggies definitely increase my symptoms. Any advice or info you have is welcome!