I was sick a few weeks ago, and took Robitussin, not realizing the cough suppresant affects supply. I took a BIG hit. Now 2 weeks later, I've gone from pumping 12oz at 3 pumpings to nearly 17 oz at 3 pumpings, without doing anything but letting the drugs get out of my system (I'm still sick). So I think with plently of nursing and time, you'll get right back to where you were.