When my husband was in the ER and was diagnosed with Diverticulitis he was told to follow up with the hospital nutritionist and it was part of the ER bill. We went one time and she basically went over a list of foods that irritate the area and what he shouldn't eat anymore.
I took a class through OSU county extension here in my town and she came several weeks in a row and gave me classes on menu planning and how to read labels better, how to cook some foods to retain their nutrition more. It was free based on income.
Call some of the hospitals in the Tulsa area and see if you can find one that has some sort of nutrition classes on the topic you are working on. There are Diabetic classes, food allergy classes, all sorts! Finding out if they have the ones you are interested in may be the start to a very fun adventure.