I had EKG/ABI/Stress Echocardiogram/Chest XR/Carotid US=normal. But when I lie down I can feel blood pumping back of neck/head. Some more testing?

Not likely. If all those tests were done and everything is normal. Don't think you'll get more info from your md. A thorough medical exam would provide equally useful info. In addition to properly answer your question note detail and description on when this happens is needed.