I'm so scared, my chest is hurting so much I nursed for two weeks, the…

I'm so scared, my chest is hurting so much I nursed for two weeks, there wasn't enough milk, it was all drained, cracked. I decided to switch to exclusively breastfeeding. Then I would have milk flowing constantly but I had already eaten everything. So it just disappeared. Now under my breast and my right one stretches out, I'm afraid something bad is happening to me??? waiting for my period to go get an ultrasound of my breasts.