Could milk be bothering newborn?

My Husband and I are at a loss. Our daughter will be 2 weeks old in 2 days. She has been going through nonstop hysterics every day for 5+ hours at a time. Last night she was up ALL night. I tried putting her down at 10pm and she didn't finally go to sleep until 5:30am. She wasn't screaming the whole time, but was wide awake. The night before, she fell asleep around 12:30. We have had some ok nights and some awful nights. She only seems to sleep about 7-8 hours every 24 hours which I know is not right. It is rare that she is awake and not screaming like she's in pain. Not just crying, but wailing hysterically and nothing can calm her. We have called the pediatrician a couple times and once they just said babies cry, take shifts and sooner or later she will cry herself to sleep. I didn't feel that was a good answer. The nurse today said try putting her in the carseat to sleep, we tried, that failed. I am wondering if maybe there is something in my milk that could be causing this. Might we have to switch to formula? I hate to do that, but if it calms her and she is not in pain it will be worth it. We feel awful and are at an absolute loss on what to do to help her.