I'm losing my fucking mind

The past week my baby will wake up in the middle of the night (ok nothing new) BUT SHE WONT FALL BACK ASLEEP. I can feed her, rock her, change her, NOTHING works. She SCREAMS in her crib unless she is being held. She will scream for hours. I'm going crazy! I can't do this! She used to fall back asleep fine on her own after eating. And she still puts herself to sleep at bedtime. But when she wakes up in the middle of the night she's up for hours screaming. I can't do it. I want to die