Suggest Treatment For Migraine And Abdominal Cramps

My name is Lucinda and I live in Austin Texas. I have a daughter who just turned 15 and has been experiencing severe abdominal cramping along with migraines after consuming food. She has also had somewhat of an acid reflux after eating no mater what the meal consist of. Her symptoms started in September but were very mild and have increasingly gotten a worse. We have were referred to "specially for Children Gastroenterology" Dr. Pandrongi, we have had an endoscopy and also a gastric emptying scan - all which have been normal. We have tried several acid blockers, none which have worked. We have even been to an alternative doctor who seems to think it is parasites. My daughter is unable to keep medication down at this point and is growing increasingly less hopeful about her situation since we have found no relief. We are scheduled for an apt with a Dr. George Willeford III to get a 2nd opinion. I really just want the BEST at this point! It has been nearly 6 months, please help with any suggestions. My daughter has no food allergies, maybe some intolerances and so we have cut out gluten, sugar, dairy, peanuts...this hasn't been easy but she is willing to do ANYTHING to get relief.