If you have inflammation in the gut, you’d be getting a noticeable amount of blood in your poo.  If that’s the case, your GI doc will label it either Crohn’s or Ulcerative Colitis (depending on where it takes place in the GI tract), and prescribe you some pills for short term relief.

If that’s not the case, consider yourself fortunate, and it likely falls under the diagnosis of Irritable Bowell Syndrome or Leaky Gut Syndrome (or possibly SIBO as you’d mentioned).   

Regardless – in the short term, try 5 – 10g of L-glutamine daily (helps heal soft tissue – like the small intestine). Then get yourself a good functional medicine doc: