What Causes Intermittent Abdominal Pain And Nausea Despite Taking Medication?
See a General Surgeon or Gastrosurgeon
Thanks for the question.
The symptoms that your 15 yr old presents related to gut pathology as nausea is typically seen there. However the current doctor is treating with empirical drugs in the form of estrogen replacements, anti pain medicine and anti ulcer along with Montelukast, which is typically given in airway diseases.
I think this is not right to give medicine for concerned systems instead make a proper diagnosis with Ultrasound or CT abdomen first.
So to answer your question you should see a specialist like a General surgeon or gastrosurgeon quickly.