Having stabbing pain radiating from left nipple (male) to left underarm. Not constant but at times unbearable. I am a 56 yo male with no cardiac or medical history. I am 5'9", 180 lbs, vegetarian, do not use drugs , and run 5 miles 3X/wk. Had a physical on Friday with EKG, CBC, Chem 12 which were normal. Pain only began on Saturday. My MD is unable to see me until Thursday.