Suggest Treatment For Heart Murmur And Mild Headache

Im 18 years old and I ve been diagnosed with a heart murmour. I was born with 4 holes now I m down to 1 that is very tiny. I drove to my school and I was fine. I got out of the car and my heart was pounding in my chest. My body was shaking and I got hot and cold. I got a very small headache. I got back in the car and about 5 minutes pass and it stops. Why was my heart doing this? It s never done this before.