Had us, hidea scan & blood work show normal range, had diarrhea 6weeks & stool normal test. abd pain& nausea yet. next step? can't eat fatty or fiber

Maybe IBS, but...: The GI tract has a very limited # of symptoms to signal its distress--nausea/vomiting, diarrhea/constipation, bloating, pain, fullness, bleeding, etc. As you know, many of these characterize ibs, but are also seen with inflammatory, infectious, ischemic, malabsorptive, and functional disorders. Maybe it's time for endoscopic testing or a trial of symptom-based therapy. Your GI doc can best advise.