My 15 yo daughter has had constant lower abdominal pain intermittent boats of constipation and diarrhea with the pain worsening after BM. This has been going on for over a month. To date we have done an pelvic ultrasound, urine test, blood test, stool test all have come back normal. We have eliminated all dairy, wheat, sugary food, carbonated drinks, citrus. Still no relief. She says the pain is like someone poking a bruise until after she has a BM and then it feels like she is wearing a seatbelt that is too tight. Any ideas?