Baby eating every 30 minutes


I'm breastfeeding my baby and she is 3 weeks old tomorrow. She has been nursing every half hour for an hour. Then she'll nap for 20 minutes and want to feed again. It's killing me because I can't do anything. She's also pooping and peeing a ton every half hour also! Does anyone have advice? I tried to contact the Lactation consultant but they won't call me back!