ER visit

Last night Eric and I went to see a movie. When it was over I stood up and got the sharpest pain/tightness in my chest and left shoulder area. It was not so painful that I could not function, it was just really uncomfortable. We got to the car, and it started going away in my upper collarbone area, but it stayed in my chest/diaphram part. The whole drive home, if I took a deep breath it felt like someone was crushing my chest. Eric insisted he take me to the ER, which I did not want to go. I knew that I would walk in, spend a few hours of tests, and tell me it was gas or heartburn. Sure enough, that is what happened. They took my blood to make sure it was not a blood clot, and normal range is 230, blood clot range is 1000, mine was 270. They offered to do and Ultrasound and CT scan, but we declined and just went home with a pamphlet on heartburn. It is now 15 hours since it happened and I still have the tigtness in my chest like a rubber band is squeeing it. Does heartbutn feel like that and last that long?????? Wanted to write this down to document so I can keep track of my issues. :)