My16 Year Old Daughter Has Had 12 ER Visits And

My16 year old daughter has had 12 ER visits and 1 week long stay in hospital for severe abdominal pain always in her right side. We've done EGDs, colonoscopy , Laporoscopy, sonos and Cts and they all came back clear. Our Peds GI specialist is now saying it's abdominal migraines, however we have no clear treatment plan for her and no one has heard of this diagnosis or what to do next - what would you suggest is to do as we can't continue to go to ER. We've tried topamax and a triptilan drug (antidepressant ) and she's on Lexipro now as she also has severe anxiety.