Been having pain in my left armpit for 1 month now and have difficulty lifting heavy objects due to pain.Need pillow under arm just to sleep. Have had this same pain off and on for over 2 yrs. now. Been to emergency room and my Dr. several time and have had many tests, but everything comes back okay. Have been diagnosed with pleurisy about 20 years ago, have had costochondritis many times, and pneumonia and bronchitis twice in past 5 yrs. (female, 52 yrs. old, taking Metformin and blood pressure meds.) HELP!!