Reflux is nasty Sammi, he will be screaming because it is acidic in his throat/chest and it will be very sore for him. He will be constantly hungry-Rebecca was, cause they bring it up, but rest assured they do get some goodness even from the stuff they bring back up.
I would advise going back to the Dr and asking about SMA Staydown, if u cant get an appt with your GP right away Boots sell SMA Staydown but its near £8 a time.
You can also try him with cool boiled water-this relieves the acidness he will be suffering.
It is a nightmare hun, I can fully sympathise!
xx