Sometime music helps, singing, if you hold her and rock dip your knees a little bit while rocking to the side. This is really not that unusual. My oldest daughter and I had lots of nights when she was little when I rocked her back and forth for half the night.
Try wearing the baby in a sling. This way the bay can feel you and still rest. SOme infants need much more contact. You might want to try white noise as well... a hair dryer, a vacuum, anything that vibrates like a bouncy chair. God, I have to say that the inventor of the bouncy chair is my hero!!!
I know it's got to be horrible but hang in there.
PS, it really doesn' t have anything to do with how stressed you were during pregnancy but if you are stressed now, she is definitely picking up on it.
Also, maybe it's gas or colic?