What Could Be The Sharp Pain, Irritating In The Heart That Has Started After A Bowel Movement And Is Recurring Every Few Minutes?

Before I begin talking about what ails me, it is important to point out that I am a healthy (not overweight) 15 year old male, with no history of hear problems within my family. Starting last night at around 7 P.M. I started to notice a consistent (consistency pinned down to every 5 minutes or so), fleeting, non-painful, irritating, tolerable, sharp pain from what had felt (and still feels) like my heart. After trying to self diagnose myself on the internet for many hours, until about 11 P.M., I fell asleep. Once I awoke, the consistent pain was still nagging me, however, the interval had increased (one happened every 15 minutes or so). It is apparent to me that the pain does not get worse with movement or deep breathing, but is more likely to be caused by such activities. The pain still persists even now (4 pm the next day), however, the frequency of pain has decreased even more (every 30 minutes or so). I would also like to express that I have experienced a heart flutter (which scared me quite a bit) during a bowel movement that I have had recently. Once again, I am a HEALTHY 15 year old male, with no family history of heart problems/disease (my great grandmother is alive to this day, at nearly 100 years old).