C.P.
I can give you a couple of ideas. At the health food store are probiotics. They actually put the good bacteria back in the digestive tract. My daughter is a high achiever, she is now 19 and in college. She always set high goals for herself and it let to a lot of stress for her. She complained a lot of a stomachache and when she got in school it was worse. I just tried to teach her relaxation techniques. A really big one for her now is exercise. Maybe get her involved in a class or something to get her mind off things.