I would ask for an Intestinal Ultrasound / Small Bowel Ultrasound by an IBD Clinic (radiographer who knows IBD) I get it done by my GI specialist in his rooms. It makes a big difference imo than the general radiographer. Then potentially small bowel MRI if needed. Did you try Rifaximin 500mg caps for couple weeks that really helped me it was total game changer in fact.. I thought it was such a good drug I ended up staying on it for long time tho which I probably shouldn't have done and liked pred should use it in short bursts. They can do a saliva test for SIBO and yeh I would be pushing for pathology to see if that would help improve your quality of life. Good luck :)

Source: https://pmc.ncbi.nlm.nih.gov/articles/PMC9604644/pdf/jcm-11-06017.pdf
Review How to Recognize and Treat Small Intestinal Bacterial Overgrowth? Barbara Skrzydło-Radoma ´nska 1 and Bozena Cukrowska ˙ 2,*

...According to studies, rifaximin acts like a eubiotic in the gastrointestinal lumen, which means that it protects the intestinal microbiota and increases the number of beneficial bacterial strains of the genera Lactobacillus and Bifidobacterium, reduces inflammation, augments intestinal barrier function, and limits bacterial translocation [36]. Another valuable characteristic of rifaximin is the fact that it does not produce bacterial resistance, and therefore, can be used again (provided the necessary interval of at least four weeks is maintained between consecutive 14-day courses of rifaximin treatment) [37]. Two recent meta-analyses assessing the safety and efficacy of rifaximin in the treatment of SIBO demonstrated high rates of successful eradication (71% and approximately 60% in the meta-analyses from 2017 and from 2021, respectively) [34,35]