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?
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.