stomach ache with nausea

My 14 year daughter complains of severe stomach pain and vomits whenever she eats something. I have been consulting various doctors and till date no one could diagnose what the problem is. All the tests carried out has been normal. The following tests have been carried out
CT Scan of the stomach
Ultra sonography of the abdomen
Renal Scan
Barium test
Test for Tuberculosis (urine and blood)
Thyroid function test
Complete blood test.
We have consulted at least three eminent gastro, two General Physician
None of the above has been able to diagnose the cause of the ailment; however the last doctor doubts Migraine and has started treatment for the same.No change in the condition of my daughter is observed.
Kindly help
Santosh Govindan,
e mail ID      santosh.***@****
Bhopal, Madhya Pradesh
India

[Ratnakar Kini, MD]

Hi,
Was endoscopy done?