Please any advice could be helpful

My baby is 9 weeks and today while i feed him he chokes and turns red and trues so hard to keep breathing and i get so scared I started hitting his back to help him out. Im now afraid to feed bc im scared he will not get to breathe and God forbid something happens to my baby boy😭😭😭 I pull him away when my milk comes down and i try bot to learn him too much and also i pull him off to give him breaks. what else can i do so that he will stop chocking on his milk?