You could be at risk. See your doctor.
Technically, a heart attack
is caused by problems (usually blockage) of vessels supplying blood to the heart. This results in a section of heart muscle being starved. The section of heart muscle affected often dies. This normally is not related to mitral valve prolapse
An irregular heart beat may be due to a problem with nerves controlling the beat of the heart. This may be related to severe mitral valve prolapse, or a blockage in a coronary artery
. Some times an irregular heart beat is more of an annoyance than a concern.
But, you need to see your doctor to have an electrocardiogram done, and to sort these out.