Thanks for the replies ladies, I really appreciate it.

I got a phone call from my doctor last night, who spoke to the pediatrician (unfortunately I am unable to get in to see him in the next few days), but the pedi has suggested that Annika could have an ulceration if she does indeed have reflux. He told my doctor to prescribe Losec (stronger than Zantac), Gaviscon, Infant panadol, and to use an AR formula. If she isn't improving by Monday, then we'll have to come up with another plan of attack. We've already tried the thickened formula, but wanted to start the meds in the morning, so I'm just waiting for her to wake up and see how it goes.