Breastfeeding Problems

I had my daughter on Thursday the 30th, and am still in the hospital. I've been breastfeeding, but she has lost a pound off her birth weight leaving her at 6lbs5oz. We have no choice but to supplement with formula, and I'm heartbroken. Watching her gulp down formula made me burst into tears. Anyway. I'm pumping my colostrum(getting hardly anything) waiting for my milk to come in. Can someone share their success story? I'm desperate!