Newbie here..chiming in with what helped us
I don't know if you're breast feeding or formula feeding, but I'll tell you exactly what took me 15 months to discover with my twins' reflux.
They had it severly, never sleeping more than 15 minutes day and night, up constantly waking each other up and the only thing that seem to relieve it was burping. Burping in itself took forever to do, too. I'd pat and pat and pat their backs, the whole time with them kicking and screaming in pain. Then finally, they'd burp and go back to sleep.
They continued this until they were 15 months old. I took them several times to their doctor, allergist, ENT, etc. to no avail. They all just looked at me like I was some kind of psycho mama..lol
It wasn't until I brought in a video tape of them screaming for four hours straight that they listened to me (and I'm a nurse..HA!..like that did any good).
Anyway, we switched to all kinds of different formulas and nothing worked, until I decided on my own to take them off of formula. WDYK? Immediately, the day I stopped, the twins (who hadn't eaten food, would scream if you offered it to them, etc.) began eating, stop vomitting, and stopped the constant crying.
Milk (i.e., cow's milk) make mucosal secretions very thick, which in turn makes it difficult to burp. It is also known to have constipating affects on small babies. Any formula that is milk-based, or if you're breastfeeding and drinking milk/eating milk products...STOP! and see if it helps any.
...I know I'm wordy, but I'm just more than willing to save you 15 months of this...