My Paed told me to express the fore milk before feeding bubs. Cant remember what it has in it that is bad for reflux babies. Baby brain
If you want to try something natural, a great product that I have found is stomach calm by Brauer. You find it in any chemist.
It does sound like your bubs has reflux. Maybe see if you can get into your paed and get some advice. Its not easy having a reflux bubs. I sympathise with you but it will get better.
Good Luck with it.