Today I ran 11 miles and at mile 10 coming up this diseal hill I had a sharp pain over my heart and then it went away. On the net on one site it says that pain lasting a few seconds and then it goes away is usually nothing serious. Basically I want someone to be like dude chill out nothing is wrong, well I hope. If anyone can tell me similar occurences or anything that would be nice. The pain was severe for about 2-3 seconds and I stopped for about 30 seconds and continued running without any problems. Thanks for reading.