This sounds like a distressing feeling. What you may be describing is what we call palpitations. These are feelings like your heart raising. While a convulsing feeling is not the typical description, palpitations have been described as a pounding or a feeling like your heart is going to jump out of your chest. If this is an accurate description of your symptoms, then you need to be evaluated for a possible heart issue. There are a few different conditions that can cause palpitations. A common condition in young people that can cause palpitations is a valve abnormality called mitral prolapse. While most of the time it causes not problems, occasionally it can result in abnormal heart function. Another possibility is a heart arrhythmia. This is when the heart abnormally beats at a rate that is too fast.
These possible problems are best looked at by a cardiologist
. This type of doctor
will be able to take a more detailed history of your symptoms and perform a thorough cardiovascular exam. Depending on what that doctor thinks, you may warrant additional testing with an electrocardiogram or a more long term monitor known as a Holter monitor
. This way your heart function can be looked at closely while you are experiencing an episode.