Breast Feeding And In Pain

My 2 week old is getting the hungry horrors, which I understand is a natural effect of him growing and trying to get my breast to produce more for his needs.  My problem is that this is the second day of this madness, and I don't know how much more I can take.  Though he will sleep soundly at night, during the day, he feeds for 2 hours straight, power naps, then feeds again, I don't even have time to pump a substantial amount to store for him. Not only is the demand for more milk exhausting, but it is also killer on my nipples.  Any suggestions?