i am 32 yrs ,black male ,bmi 20.last September i developed a burning pain on the left side of my chest.the GP gave me aspirin,pdnoslyn and ciproflaxacin.the pain faded for a couple of weeks but returned a month later.this time the GP gave me erythremycin,aspirin and amitriptyline.the pain has since spread to my abdomen,left arm,back,shoulders and neck.doctors have suspected gastritis and i have been on omeprazole and declofenac for over month but there is no improvement.The pain im my abdomen is worse when its empty and when i am seated upryt.my chest X ray,ECG,and FBC have shown nothing.what can this be?i'm stressed.