I have upper abdominal pain that comes and goes sometimes feels like a burning or nawing feeling that sometimes is relieved by eating but the pain often travels to my back...Then after eating I tend to bloat in my upper stomach area even sometimes with belching other times just feeling constantly full no matter if i eat a small meal or regular size. I have been having a sour bitter metalic taste in mouth the last week off and on and today the pain seems to feel deeper and more of a achey or even a lil crampy still traveling to my back area under the breastbone. I also sometimes feel acid or burning in my chest area and even sometimes short of breath when I have the acid. any idea what this may be