Permanent SIBO due to removal of ileocecal valve

Hi everybody 🙂 I know this is an old thread, but I found it when searching for information related to SIBO and a missing ileocecal valve and wondered if anybody on here could help. Thanks in advance for reading 🙂

Like @tiss, I had a cecal volvulus when I was 24, back in 2012. I had an emergency right hemicolectomy removing about a foot of small and large bowel all together, including the ileocecal valve. They resected my large and small intestine - I'm not 100% sure where exactly - but somewhere around that whole right side area where the ileocecal valve would have been. Ever since my surgery, I've had persistent trouble with extreme bloating from eating that lasts for multiple days, nausea, loss of appetite, and just an overall ill feeling stemming from my gut. I've been working with a gastroenterologist and a GI dietitian for the last year, but unfortunately we haven't made any progress. At one point, they did an x-ray while I was extremely bloated to hopefully gain some clues, and saw that my stomach was totally full of air and very enlarged (they wrote in the notes that I had gastric distension). This led them to do an endoscopy to rule out a gastric outlet obstruction, which came back negative. They did a colonoscopy shortly after, and everything looked mostly normal except for a spot of irritation they found on one section of the colon. They tested to make sure it wasn't Crohn's, which it wasn't. We still don't know what that irritation was or if it's related to my symptoms. The worst symptom for me is the bloating/distension, and I haven't yet found anything that relieves it. Often times I'll just eat one meal in the morning, and get so full of air/pressure that I'm physically unable to eat for the rest of the day. Once it gets like that, anything else I eat just makes it expand more and more. Here are the things that I've tried so far, under the guidance of the dietitian and gastroenterologist:

-Xiaxifan (for SIBO)
-Cipro (for SIBO)
-Strict low FODMAP diet (I'm still currently following this just for good measure though it doesn't seem to solve the problem)
-Specific Carbohydrate diet
-Low residue diet
-Dicyclomine (gut anti-spasmodic)
-IBGard
-Alpha-galactosidase
-Meal spacing (4-5 hours apart)

I've also kept a detailed food diary of everything I eat and the symptoms, but there doesn't seem to be any real rhyme or reason to it. Like the original poster, I'm wondering if this is just chronic SIBO due to the fact that I no longer have an ileocecal valve and therefore nothing is stopping bacteria from populating my small intestine. It was encouraging to hear that Xiaxifan worked for @tiss, but I still haven't had any luck with it. I'm currently on it again and we are going to try it longer term to see if it eventually kicks in, but I haven't noticed any difference so far. I guess it could also be something that's not SIBO at all, which could be why antibiotics haven't worked, but so far neither me or the doctors have been able to figure it out.

Any ideas would be greatly greatly appreciated. Thank you so much 🙂 !