Post surgery their can be a lot of things going on in there none of which are typical of IBS. However pain is typical of IBS.There is chronic functional abdominal pain which is all the pain of IBS without the D or C, and that reducing gas load reduces the pain could be functional, but could be adhesions or other scarring issues from the surgery, but I think they would have seen those wiht the tests.A Gyn exam would not be a bad thing to have done in case the pain is from there rather than from the intestines.K.