Just wanted to share my experience in case anyone finds it helpful.
My 8 week old was recently diagnosed with reflux - we had awful trouble feeding, after a short calm feed (30-60mls) he would start crying and arch his back and refuse more food, although he initially did want the bottle back. It was just terrible.
The pediatrician suggested infant Gaviscon, but as I was hesitant to head straight for medication I asked if we could try a stay-down formula instead. He agreed we could try that & I was lucky enough to find a couple of tins of Enfamil A.R. (anti-reflux) in our local pharmacy. It's a thicker formula than regular milk, the thickener is just rice starch I think.
We had to change to vari-flow teats (Avent make them), as the formula is too thick for a regular teat. Making up bottles is easy, no lumps.
The change has been remarkable. Suddenly he's very happy to take 150 mls at a time! He just loves it and there's no more screaming at meal time. Initially the new formula made him constipated, which had me very worried, but it passed quickly.
Worth a shot if you're in the same boat. Good luck if you are.