I've had 3 kids. Two had severe reflux with feeding aversions. One (now 14 weeks) has colic and reflux. All 3 have food allergies. In my search for support, I've learned so much and come across some good websites.
Most doctors under dose reflux babies because the FDA recommendations are based on studies done on adults. NOT on kids. There is a research institute in the midwest that has done actual studies on young ones with reflux and has complied a great deal of information and tools (like a dosing calculator) so that we can actually get help for our kids. The website is noLinks://www.marci-kids.com/.
Another is a forum just like this one, but for reflux kids. It is: noLinks://www.infantreflux.org/forum/.