Hi all

I am here again, I have been experiencing a pain in my left boob that feels like a sharp stabbing pain that comes and goes, initially I was worried about heart but a few months ago my doc said the pains were not related to my heart. Now I am going into serious panic mode about breast cancer.
The pain moves around from round my left rib cage area and shoots across my left breast.
It isn't affected by breathing or anything, could it be muscle as its the arm I walk my dog with and he pulls, or could it be nerve endings or something more serious.
Has anyone else experienced anything like this, could it be worse as my period is due within the next week?
reassurance please...

xx