Amanda - my oldest daughter had the same problem with her first one, and after a couple of weeks, when Kate wasn't getting enough, she gave up and started bottle feeding - Kate is now a healty, active amazing, delightful 3 year old. Juli was able to breastfeed her 2nd Matthew for a month or so, but finally started bottle feeding him because the Pediatrician felt something in her breastmilk was aggravating his Acid reflux. Now that he's 5 months old and starting on baby food, things have gotten much better - so hang in there, things all work out in the end.
I agree with Joanna, you new Mom's are made to feel that you've failed if it doesn't work - just do what feels right to you, thats my best advice. (not that you actually asked for it, haha) :D