GI specialist recommendations in Houston?

Does anyone have a good recommendation for a gastroenterologist for a difficult diagnosis? I've been having intestinal pain (burning sensation on the sides and sharp pain in localized areas) for a month but all of the specialists I've seen treat it as gastritis.

I am looking for someone who may take the time to look at all of my tests and consider all possibilities. I'm in the inner loop but willing to take a bus anywhere in the city.