A pain of this severity indicates or points towards infection. There may be associated product of conception or retained clot associated with the infection. You would need an ultrasound examination to see the uterus and adenexa (get it repeated, if they were done earlier). If your uterus is not empty, you would again need a dilatation and evacuation (D & C), since infection cannot be eradicated or no antibiotics would work if there is something retained in uterus. But since at present, you don't have any bleeding, chance of anything in uterus is quite less and possibility of the infection is predominant. So an antibiotic prescription would be the call.
Please feel free for your follow up questions.