I'm 16 years old, healthy, athletic, and alcohol/tobacco/drug-free.
For the past two weeks I have been having trouble with my heart. I am a competitive swimmer, and I swim about 2 hours a day, sometimes 4 if I have morning practice.
The first time I realized something was wrong, it was when I was swimming a few laps in the pool for warm-up during afternoon practice, and after about 4 lengths, my heart seemed to roll around in my chest, like my heartbeat was caught on something, especially on my intake of breath, and made me gasp for ait. That continued for about three or four breaths, and went away. My heart rate was a little high for about another minute or two and then completely settled down. I told my coach about this, and she said that I might have been a little stressed lately and I should take the practice easy for the day.
After that one day, my heart didn't seem to have any issues and I continued swimming my practices, and all my swim meets went great, with best times and no particular effect at all. But at one swim meet, probably about a week after the first episode, I was getting ready for my race, and moments before the race began, I inhaled, and my heart "flopped" again, but this time it was only for a split second. That race went fine, and I didn't particularly have any problems breathing or swimming. Since it was coming to a point where the issue was occurring during my races, I decided to talk to someone about it. As it happens, my swim team captain's father AND mother are both surgeons, and good family friends, so I told her father about my problem. He said my symptoms sounded like an irregular heartbeat, like a "fish flopping around" in my chest, and that was EXACTLY what it felt like. He told me that it is probably nothing serious, that I should just get more rest and drink LOTS of water (I'm somewhat prone to dehydration).
Now the irregular heartbeats happen almost all the time during practice, always during the short quick sprint sets that we do, and my heart beat is much stronger and faster than it used to be. My heart rate is usually very quick at slowing down after a few sprints, but now it continues to beat so hard that my chest feels like its being stepped on by someone's foot and makes it hard to get a full breath.
I would really like to know what the causes might be for this, and if I can prevent it from happening.
Thanks