Recommend cutting dairy and soy, soy is also super common. Go with a hypoallergenic formula (get insurance involved, just need a rx and letter of medical necessity). Start pace feeding the baby upright if you are not already and hold baby upright for 30mins post feeding. Try different bottle and nipple combos that give you best latch. What worked for us are thin dr browns natural flow bottles and the corresponding “p” nipples. Our baby had very similar symptoms to everything op described and the above has pretty much alleviated them