What Does This Echo-cardiogram Test Result For Rise In Heart Rate Indicate?

My heart beats so hard at night I cannot sleep. It starts beating hard about 45 minutes after I lay down. I recently had an echocardiogram and the test results was that I have mitral value regurgitation and extreme pressure. Since this test was made in the day time my heart was not beating that hard. I am awake most of the night even thought I try to sleep on two or three pillows. This started two to three months ago. I get very little sleep and I dread going to bed. It beats the hardest when I lay on my left side.