Hi BEAR! Many things your sister could try, there is citracel, metemucil, fibechoice, I heard Evian water has helped many, magnesium, oatmeal, there is a thread that a certain bread helped many, forgot the name, look up the threads and you will find it, think stomachtroubles posted it, as for gas, beano, gas x, I am sure ther are others, my mind is jello, just woke up a few minutes ago. If the pain is bad, have her see a DR and prescribe something for pain, or she could try tylenol, or advil for the time being. She will need to seek what food and drinks affect her the most by trial and error. Hope she feels better!