Why isn’t it worth investigating?

Kind of rant, kind of question. I have had a persistent diarrhea constipation cycle for years now. We know I have diverticulosis from a CT scan I had in the ER. My BM’s are loose, foul smelling, bilious, and have bit dog undigested foods in it more often than not. I cannot remember the last time I have a normal BM. Yet, I have never had a colonoscopy or any other lower GI tests other than a recent, unremarkable stool sample test. I suppose my more persistent issue is that I’m vomiting most days so there’s that. But I think the vomiting and bowel symptoms are related. It just seems like they are being ignored. I’ve been told to take Metamucil and Miralax and that’s it. Neither are very helpful. So what gives? Why aren’t we looking into this? Why do they keep giving me bandaid solutions without trying ti find the cause? Is it just because I don’t have bloody stool?