Alex - how are you burping? There are different techniques.

I found what worked for Maggie was to hold her upright against my chest with my breast against her tummy. I would then rub upwards with my right hand on her left side (as that is where the stomach is) I would only apply pressure on the upward stroke. That was the most successful for me. DH has his own technique for her, but that takes big strong hands to do.

I know reflux is not fun. Good luck I hope it gets better soon.