I have had an uncomfortable pulsing in my abdomen (left side right under rib cage) for some time now. Along with this I experience cut off circulation to my hands and feet (mainly feet), sharp back pain, rapid heartbeat and pressure (painful) on my left side chest area. Along with a slight pain in my left arm. It s there every day. Every hour. And it has changed my life in a number of ways. I need to figure out what this is. The feeling can best be described as a pulsating mass or buildup. Aortic valve? Gastrointestinal? Anything. I need advice. Oh, and I forgot to mention I m 17, 145 pnds, and perfectly healthy (it would seem). Thankyou. - Collin