I ve had bubbling sensation in the left chest. My lung functioning test was terrible. I ve taken stuff for GERD with no help at all. I ve been coughing up grey stuff that some say is post nasal drip. Since this all began, I have no emotions and don t feel fear, pain, etc. It s strange. I have Prozac and that doesn t help stuff. What kind of underlying thing could this be? Stress test, heart stuff is all good. Nothing makes it worse or better. I use to be able to feel my heart beating hard when I work out and now, despite intensity, etc, I don t feel it. I only feel it on the left side, under my left breast. I really want some answers but only keep getting pumped full of antibiotics and stuff for my stomach. I want to know what could cause left chest symptoms like this and then not be able to feel. Please help!?