I was just stood up for about 5 minutes when suddenly I got this really horrible Chest pain as if someone just stabbed me. Kind of to my left above my breast and it felt like I suddenly felt paralysed because it scared me so much. Now I'm crying thinking that was my heart. I wasn't anxious before whatsoever so couldn't of been anxiety. I had test done before and everything was great. I do have a muscle problem in the same area which sometimes acts up and also because I fell at roller skating two year ago I have two slipped disc and one is actually in the upper spine. Could it just been a trapped nerve? Or should I worry?