help!!

I am 36.3 weeks today. Last wed. I went into LD because of vomiting and contractions that were regular and wouldn't go away with change of pos. Or water. While I was there my blood pressure kept being unstable because of the medication that was given to me to stop the contractions (which didn't work) I was told I was 2cm dialated and that sice they saw no cervical change I was sent home. They told me I had a bladder inf and sent me home with keflex for the "inf"... this Saturday I went back in for increasing contractions. I was 2cm and was admitted. I was given a shot to stop the con. Which just made me feel high I was also given the same med from the last time and nothing worked. My cervix did change to a 4 but was sent home that morning...today I went in for increasing con. Wasn't there an hour before I got sent home...any advice on what to do now? I'm having bad con. I have bloody discharge and my head is pounding!