Best lump and shoulder blade pain

Hi 

I'm 37 mum of 3 

I found a lump in my right breast a week ago and seen my doctor straight away I thought she would say its nothing but she  has referred me for mammogram I have a really dull pain between my shoulder blades in my back and tender in both armpits  im freaking out its all connected has any of you experienced this. 

I'd love to hear from you