MC with Cytotec?

Does anyone have any experiences to share? Yesterday at 14 weeks I found out the baby stopped growing right after my last ultrasound at 12 weeks... I've chosen to have the MC naturally but Dr said I needed to take the Cytotec to help it move along... I took it earlier and this is horrible, excruciating pain.... how long should this last?! I keep getting sick cause the pain. I hate this.