Hello Tb2. I remember when I began hearing what I thought was my heart pounding in my left ear. Is it in just one ear or both? And have you tried to tell if the pounding in your ear is keeping rhythm with your heart? The reason that I ask is that what you might be experiencing is called pulsatile tinnitus. Mine is intermittent but is worse when I lay down. I also feel tingling in that ear and I hear ringing too. I thought that I was having a heart attack and went to see a cardiologist but my ticker turned out to be fine. I can't help you with a diagnosis of why you are experiencing the tinnitus but hopefully this information might lead you in the right direction.