I think you should consult again as I do not believe you should not be eating any cousins of the Fiber. Fiber can not be disolved in water (some of them) or easily digest by the body:

The fiber, a type of carb your body does not digest, is what makes these foods hard on someone with an inflamed colon. In addition to raw veggies and fruits, stay away from cooked kale, peas, winter squash, broccoli, Brussels sprouts, cabbage, onions and corn.

The reason I say this is because every doctor (an absurd amount of them) and gastro (3 of them) will first recommend Fiber. I was so desperate with the pain and bloating that I was eating apples with the peals and celery. Finally I was officially diagnose with Gastroparesis and fiber is an antagonist of Gastroparesis. My gut feeling literally was that if I would eat fiber or Metamucil or Fiber One or Magnisum or any product with capsules or microcristalline I would get swollen. What surprises me is that a number of doctor would recommend Fiber and Magnesium when at least Fiber should not be recommended before an Emptying Stomach Study (that should be protocol). I am saying this as a System Analyst. That is my particular case.