Hey!
IBS and IBD are addressed very similarly. This article may help: https://holisticspring.org/2020/08/20/irritable-bowel-syndrome-understanding-how-it-works/
As far as IBS is concerned, you NEED to do a pathogen cleanse, do low carb and low sugar diet, eat soft and warming foods rather than lots of raw and cold foods. Consume plenty of glutamine rich foods such as gelatin and broth, and antiinflammatory aloe and slippery elm tea/herb.
Transcutaneous vagal nerve stimulation is 100% necessary too but of course chekc with your doctor before doing it or taking any supplements.