I am a 32 year old white female...I frequently here lately have a pain numbing...feels like a burning sensation under my right arm pit and runs under and down the back part of my right arm...the pain seems to be there more when I am just relaxing not after I have done anything strenuous or anything...I seem to get a little bit of relief if I hold my arm up in the air or if I lay down on my right side...I sometimes even have sharp pains in my chest on that side just above my right breast....no shortness of breath or anything...what is this?