Mom and NICU babies

My baby was born last Wednesday. She was in distress when born and was taken to NICU for heavy breathing and low blood sugar. Her blood sugar came back to normal but she was having issues keeping her breathing under control. She finally has that under control but now her heart rate dropped to 57 early this morning. Has anyone else went through this and everything be okay? What was the cause of it? I just want my baby home more than anything and she always gets so close then it seems like something happens...