Try Yu Yee oil.. put a little on the lower tummy. Also keep burping him.. between breastfeeding each side, or if you’re using bottle, after every about 30ml. My LO seems to be able to pass wind/poop better in certain positions, especially when her hips are bent. So sometimes I carry her around the house for a while in the “sitting position” (supporting the head), or she’s propped up on my legs facing me, and her legs are against my tummy. I’ve been in your shoes. I cried because I felt so helpless and she sounded like she was suffering so much. Hang in there.. keep trying all sorts of ways to help baby let out the gas. Also avoid eating things that make you gassy/baby fussy. Hope this helps:)
Cherlyn