So sorry!! You might leave a message for a lactation consultant and ask them for a ASAP visit Friday. In the interim, pump, pump, pump!!
In the meantime, I suggest this to help. It is magical. All Purpose Nipple Ointment.
http://breastfeeding.about.com/od/nippleproblems/qt/tripl...
I nursed my two kids for a combined total of 31 months!! This stuff saved me in the first month or two after birth. You need to have your OB write a prescription and go to a compounding pharmacy to get it (there are plenty of those around, but you can't usually go to a CVS type pharmacy). My LC gave me the name, and I was able to call my after hours nurse to get filled. I found lanolin and other creams worthless.
Good luck, keep at it. Keep pumping. Even if you have to supplement, that doesn't mean you won't be able to keep nursing or even nurse exclusively later. So don't make yourself anxious over it. I hope you get some help in a couple of days.
I used an independent LC, and frankly, she probably would have come on Thanksgiving to help me! My hospital LCs were never any help, even in the hospital.