breast cancer

My name is theresa moore. I was diagnosed with stage 2 breast cancer in my left breast 17 years ago at 42 years old with a 1.5cm tumor and 3 positive lymph nodes. i had a lumpectomy , radiation and chemotherapy including adriamycin. I am now 62 and calcifications found in a mammo in oct. in the same left breast found a cancer. Pathology revealed a ductal carcinoma -in-situ (DCIS) -0.5cm. and an invasive cancer -tumor size 0.7 cm. (Er negative, PR negative and Her2 positive (3+). Margins not involved. Sentinel lymph nodes were clean. It has been two months since my surgery and the oncologist i saw ( the doctor who treated me agressively 17 years prior) at first told me that i required no additional treatment- as he was hesitant to treat me with more chemo as I have high blood pressure taking toprol XL100mg and Benicar HCT and was treated with adriamycin previously. He said he was concerned about heart problems and leukemia. After he consulted with another oncologist he decided that I should be treated very aggressively with taxotere, carboplatin, and herceptin. Chemo every 3 weeks for 6 mos. along with herception once a week for a year. What also puzzles me is that he said if my tumor was 0.6cm I would not require treament and sometimes the pathologist are in error and the tumor might have been larger than they are reporting. Has it been too long a time period for treatment or do i really require treatment as he first stated?