Hi, recently I felt swelling at the end of my skull behind the left ear and the feeling is bad AlL over body including dizziness, lack of concentration etc.I am having severe Gas, acidity and heartburn problem including shoulder and neck pain. Now my Heartbeat is very fast and loud sometimes. This left side pain is confusing if it is related to heart problem. I don't know if I have heart or lung problems. Swelling receded after I used heating pad. But now feeling slow pain on the left side of skull end and heart problem is there. I have cut smoking otherwise I am a healthy guy. Please advise.