Hard Day

My little girl is 9 days old today. She's been a pretty easy baby for a newborn. breastfeeding has been hard, and I'm exhausted, but she usually doesn't fuss much and let's us sleep for a couple stretches at night. But today... every time she's not nursing, she's screaming! I'm exhausted. My husband and I just keep taking turns rocking her and trying to calm her down. She's barely slept all day (which I'm hoping means we'll have an easy night). I hate hearing her cry so much, but I also just need a break! I want to just put her in her swing and let her cry it out, but then I feel like a horrible mother. Any words of encouragement? Or even just someone going through the same thing?