for a couple of days now everytime i try to inhale i feel some kind of discomfort,stabbing pain in my chest area. and im really scared i dont know what this can be. As i inhale and hold my breath, i notice a lump in the middle of my chest, between the lower part of my 2 breasts, (im a male), what can this be. this lump is hard and fixed, kinda hurt if you press down on it. any ideas? can this be a fixed lymph node