From what I have read, reglan can cause Parkinsons like symptoms. So basically if your child does not have DGE, Delayed Gastric Emptying, than you should ask your doctor why he/she is on it.
Reflux can be a side effect of a milk or soy intolerance, so many of the children on this site also have an intolerance to milk and soy proteins as well as alot of other things.
I am sure Nataliachick has a much better answer so hopefully she see’s this before your appointment.
If your child is in pain I would ask for a PPI like Prevacid or Zegrid.