For the past few days I have had pain in the middle of my chest. It lasts about 10 seconds and happens every 5-10min. Should I be concerned I dont have anything stressfull going on, I am not overweight I exercise regularly since im in the marine corps, but I work a 24hr shift at work and it started at about 2 am on my last shift and is still going, I ate breakfast thinking I might just be really hungry and still getting it, I also took a 6hr nap since I didnt sleep during my shift. Could this be serious? I know I need to see a doc just wondering if anyone else had this happen to them im only 22yrs old.