Hi S.,
This is totally normal. In fact, I have a 6 week old who has been going through this, too, but seems to be getting better, and I was just reading today that this is caused by "a temporarily uninhibited nervous system that causes excessive arousal." This phase will pass around six weeks or so as the baby's brain matures. I've had seven, and they all went through this. It took me until number seven to find out that it's just a phase! So rest assured, it's nothing you're doing. I've found that I just have to not plan on getting anything done at night, so I can just hold her and soothe her. She likes to be held when she's like this, and I also find that I need to keep switching positions. Your presence will keep baby feeling secure, even though it may not seem like it.