I think I'm going to quit

breastfeeding has been so challenging. Baby has a perfect latch but I dont think he is getting enough milk. Every other 2 hours I pump 5oz, then down to 2oz, then 5oz and back to 2oz and only in my right breast. My left one either gives me 1oz or barely any trickles. When I latch him on he cries, screams terribly and chokes from the letdown squirting in his mouth, which makes him intake air and now I have an inconsolable baby with trapped gas that's hungry but not satisfied with my feeds. I want to cry. Baby is 6weeks old. Help. I want to go buy formula and say fuck it. I'm trying so hard, I feel defeated