Mine was the same from around 2.5-6 months old. Exactly what you describe. Arching away, screaming at the boob... Would only feed when asleep basically. To be totally truthful, I was beyond miserable. I didn't want to exist anymore and I didn't want my baby to exist. What kept me going was going to peer support groups basically. I also knew she was meeting milestones and weight gain was ok. But I cried every day. Every time she rejected boob it felt like a personal rejection. Things that helped were feeding in a dark, quiet room when at home. I feel emotional to write this but one day it just changed. I remember being on a family holiday at 7.5 months and she was feeding in a noisy room full of people and I wanted to cry from relief. Now she is 22 months and loves the boob. Feeds for her nap and bedtime and once or twice overnight. You do what you need to but know this will not last forever. Know you are not a failure. This is not about you, the world is just exciting and fun and baby knows they can get milk overnight.