I am a relatively healthy 28 year old, I have smoked in the past (for about 12 years) but have since quit. I drink socially and other than that, I am quite healthy. I exercise regulary and dont eat junk food. So, anyways, I got pericarditis about a year ago, and finally after 2 trips to the er they diagnosed it and sent me home with the advice to take aspirin for a few weeks. Well, it cleared up and then about 2 months ago I started developing the same symptoms. I made a few more trips to the er and had no definitive answer on whether or not it was pericarditis. The symptoms I have been experiencing over the last 2 months are dizziness, lightheadedness, nausea, muscle weakness, tremors, rapid heart rate, high blood pressure, pounding heart, palpitations, feeling very cold, headaches....There are probably a few more but I cant remember right now. Anyways I went to see an internist and he listened to my heart and said he heard a knocking sound. Well I dont think that hearts are supposed to make a knocking sound. But I am scheduled for an echocardiogram to find out what is going on. Does anyone know what could be going on? I have also been having mild discomfort in my chest as well as mild indigestion. Please, if anyone has any helpful information it would be much appreciated as I am very worried!!!!!