Idealist
my son had exactly what you are describing and we went thru a range of misdx (over a year!!!) till this summer a colonoscopy revealed he had Crohn's Disease. We have started a natural treatment program for it( specific anti-inflammatory, anti-spasmodic and healing supplements plus special diet) and things are sooooo much better.
However, if you had exploratory surgery (colonoscopy?) thay would surely have detected if it was Crohn's/Colitis etc
I do know that yeast infection of the GIT (candida albicans) can sometimes also cause persistant pain and IBS symptoms
Cara: Dont know if you have heard of a natural treatment for H pylori called Mastic gum.
The Gum Mastica eradicates the bacteria, while using it with Slippery Elm & L-Glutamine soothes & coats the ulcerated areas, and DGL-liquorice root heals the erosion