Feeding advice

Video in comments it won’t let me attach it to the post All advice welcome , why does my little one keep doing this when feeding, she seems uncomfortable and it hurts my breast she pulls her head back while kicking. She will do it for a few minutes the stop then start again, at first I thought maybe colic , I’ve been using gripe water as and when it’s needed and she’s been passing her wind really well now but she’s still doing this through most of her feeds it’s worse at night and she won’t settle when she’s doing it , she’s exclusively breastfed I’m I’m worrying she’s not getting enough milk ! Please someone give me some advice I’m one exhausted mamma 😫