Breast Cancer

Hi I am 63 8 weeks ago I had a pacemaker/defibrillator fitted for A Fib and Heart Failure.
Tuesday after a routine mamamagram 3 weeks earlier.  I was told I have invasive ductal cancer grade 2. It is  1.6cm and is ER positive. I am still in shock and feeling pretty fed up, 18 months ago I was walking 6 plus miles a day with my Border Collie now I have Heart Failure and cancer.

I am having surgery on 16th December, I can have a mastectomy or a lumpectomy, they said if they do a lumpectomy and find I need further surgery I can go back in, but if I go for a mastectomy and a lumpectomy would have not been needed they can not put it back.  I am so confused I want it out!!!!!  I know if I go for a mastectomy I will be a little lopsided I am a 38DD, has anybody had both taken off when one side is cancer free. I don't want reconstruction surgery. 

Not sure how my pacemaker will affect my surgery 

Help I am so confused. X