you should check out the book The Gut Health Protocol https://www.amazon.com/Gut-Health-Protocol-Nutritional-Intestinal-ebook/dp/B00VCP5PKW
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I used this guy's treatment method for my IBS and it has been really good for me. He talks a lot about how sugars feed the bad bacteria in your gut, and you need to eliminate that bad bacteria and feed the good bacteria to create a better gastroinestinal environment in your gut. It's a difficult protocol to stick to at first but over a year after I started it, I can confidently say that although my IBS issues are not gone, they are very much improved.
You could investigate the following:
- Low FODMAP (Monash app and website are useful)
- SIFO/Candida (carbs could be causing some of your issues) - (check this book out: https://www.amazon.com/Gut-Health-Protocol-Nutritional-Intestinal-ebook/dp/B00VCP5PKW)
- Leaky-gut/auto-immune disorder (check this book out: https://www.amazon.com/Paleo-Approach-Reverse-Autoimmune-Disease/dp/1936608391).
Unfortunately conventional doctors, even GIs, are often unequipped to support chronic health / nutritional issues. Functional medicine practitioners such as naturopaths sometimes fill the gap, but these aren't always covered by insurance plans.
Both books are really really good - check out the amazon and goodreads reviews! Good luck to you.