the following has happened a few times...I was sitting in the pub at lunchtime all nice and calm with not a worry in the world when all of a sudden..I got a sharp pain that seemed to be moving up my vein in my left arm then it moved to my left breast. The pain lasted only a second but left me with an aching left breast. I have had ECGS galore and docs have found nothing. The pain was so sharp it took my breath away a bit..not literally but sort of stopped me in my tracks.