ER visit

So I spent 7 hours in the ER last night because I had been having sharp chest pains on the left side which radiated to my left shoulder. They ran tons of tests and even had to do a CT scan (which I didn't want but knew it was necessary) to rule out a blood clot in my lungs. Everything seemed to be fine. But I still have this pain and it will not go away. It's worst when I breathe in and while I'm standing up and while I'm walking. Nothing relieves it. Anyone else have this pain before? It's almost been 48 hours and I can't take it anymore.