What Causes Pain Breast After Being Elbowed?

hi over 2 months ago my daughter elbowed me in the breast, it was very sore but has eased a bit , if i brush passed something I sometimes get a sharp pain,been to the doctor she has refered me for a mamogram , but could be 10 weeks before i get seen ,now every minute of the day I worry sick that i have breast cancer, that I cant think of anything else