When to visit the ER for IV fluids?

Long long story short I had two root canals yesterday afternoon. After the numbness wore off I was so sore that I was up all night. From 6 am I felt very sick but not nauseous. I haven't been nauseous all day. However, I have vomited all day. About eight times. My mouth will start to water and then vomiting.  The last three times there was blood in my vomit. My throat is now so sore that it hurts worst than my teeth. I haven't been able to keep anything down. Not even water. I'm so worried. I did call the dentist and leave a message.  She hasn't called back yet. At this point it is extremely painful to swallow, even water. Can I go another night and hope it gets better or should I visit the ER?