in 2017 i was diagnosed with breast cancer on the right side i had 6 rounds of chemo and a mastectomy and full lymph nodes removal . all was fine. i had a mammogram in October 2018 and everything was fine. but last week my left nipple started to be very painful , at first i thought it was maybe my bra that was too tight but 1 week on it agony. im not sure if i can still ring the breast care nurse i had 16 months ago or do i go to my g.p. to be referred again, and is it even possible to get breast cancer in the opposite breast 16 months after the last time . please someone help