Mvp and mild mr. everytime i eat,do mild exertion or laugh out loud for a long period, i get out of breath and my heart pounds and geta crazy fast. y?

Could be related: MVP & mild MR usually don't produce any symptoms. However, MVP can sometimes cause palpitations or chest pain. You should see your MD for an evaluation. A Holter monitor will be helpful to follow the rhythm for 24 hours, but counting your heart rate during the episodes can also be helpful. Even if there is no real arrhythmia, MVP can sometimes be treated with beta blockers to relieve symptoms.