This is almost exactly the same for our now 9months old DD. DD did this, especially in the evenings from about 6pm until 11pm or so. I think it is common, as Cazee said, building up your milk supply, especially in the evening, as she needs it to get her through the night (which for a newborn can be a couple of hours most!). And getting to know you, the world around her, its very open and new and big for her, she needs her mummy.
DD settled down after a while, cant remember how long, but probably 2-3 months, however, she was crabby and fed lot more around bedtime until she was about 6 months old, but less intense/boobs god used to it/i got used to it.
All I can offer in the way of advice, is to rest as much as you can in the day whilst she is resting more, eat well, drink plenty of water/fluids and be patient. When you feed in the evening, expect it to be like this and prepare yourself, water and some snacks at hand or get DP to wait on you, a book if you feel up to reading. Some lanisol for your sore breasts (oh and apparantly dark green cabbage leaves is also good for sore boobs) It will settle down, and I think it is perfectly normal