During nighttime for the past two weeks, I've been getting a couple of 2 second long sharp pains in my heart. I'm 18 and I'm very physically active, my body fat is somewhere around the 12-13% range. I'm kind of scared, also I haven't been pooping as much these past couple of weeks, any idea what it could be?
[Edited on 12.02.2012 7:56 PM PST]