This has happened to me too. My name is Lindsay and I am 15  years old. I have been getting these weird sharp pains in my left side since I can remember. I just had this pain about 10 minutes ago and I decided to look it up to see what it could be. The only answer I got online was something called pericardial catch syndrome (PCS). All the symptoms listed match up. I was just sitting on the couch and moved quickly and the pain started. It hurt really bad to get up but I managed to get up and move over to my computer to look it up. The pain is still there right now, but it is not as bad as it was about 10 minutes ago. I am not sure if stress it related, but it is possible because I have finals this week. I have told my parents about the pain, but they say it is nothing. However, I am very worried about it because it is very painful. Glad to know there are other people out there with the same pain.