Hi welcome to Health care magic forum.
Thanks for choosing H.C.M.Forum.
Your son of five years age is taking deep breaths, on and off, even at rest, Xrray was normal, pediatritian said it may be
allergy, and prescribed fluticsone
nasal spray , but not helping. he had
GERD, upto the age of 24 months.
It may not be related to either of the diseases you are thinking to be , breath lessness, or G.E.R.D.
I think it might be a psychological , may be related to
gastritis, due to lactose intolarance, or
indigestion.
I advise you to
consult a psychiatrist, with this you can have a god result.
Besides i advise you to avoid milk and milk products .
Wishing him a quick and complete recovery.
Best regards.