any advice for healing a split nipple?

Try using coconut oil.

Hey @nbrooks8891 I know how you feel =\. I used https://www.google.com/shopping/product/16339115962112664891?lsf=seller:4008471,store:7553314819026817753&prds=oid:17295712026617802810&q=nipple+creme&hl=en-us&ei=4PKAWP2fOsbJmwHOgYzAAQ&lsft=sid:KDx20141117x00002xlpla&lsft=gclid:Cj0KEQiA5IHEBRCLr_PZvq2_6qcBEiQAL4cQ0yhWGrpUayUgRpJzB_wtO6F5t9UEQLs2wby52I6uAFwaAmQQ8P8HAQ#sgro=om

And it's helped me. Good luck and feel better!