HI.
Thanks for your query and an elucidate history.
As pr your history your son who is just 12 years underwent
cholecystectomy, and has chest pain and upper abdominal pains.
History of medications and endoscopy,
eosinophilic esophagitis noted .
I would advise the following in such a case.::
Barium study of the esophagus under fluoroscopy control to see whether he has
motility disorder.
CT scan of the abdomen to see if there is associated
pancreatitis, abdominal lymph nodes , any disease affecting the lower part of the lungs or pleura?.
Consultation with a Child
Psychiatrist should be done just to confirm that he is not suffering from mental ailments.
Continue the medicines, Give him foods in multiple small quantities.
Please keep me posted about the esophageal manometry reports and the effects of the Psychiatrist consultation, his medicines and all.
A course of an antibitic, metronidazle and antivermins will help.