Dear LMF, With the presense of cancer in the lymphnodes, adjuvant chemotherapy would be the standard of care. (The actual stage of your cancer would be determined after the results of this second surgery are in). Combination chemotherapy (use of more than one type of chemotherapy) most likely will be recommended, and the combination will take into account your overall health and individual situation. Based on the second surgery (if this was a mastectomy or not) would determine if radiation would be done (if lumpectomy - yes, if mastectomy - maybe). Your hormone receptors are positive, so adjuvant hormone therapy would be recommended. The current standard of care is use of tamoxifen, arimidex is used in treatment of post-menopausal women for treatment of metastatic disease, although it is currently being studied more in terms of long term results as adjuvant hormone treatment. Herceptin is used in treatment of metastatic breast cancer that expresses a positive Her-2neu receptor, it's usefulness in terms of adjuvant therapy is currently being studied.
You will be referred to a medical oncologist who can help you in terms of sorting out as to what the best treatment plan would be for you. Also they would be able to advise you as to whether you there are available clinical trialsin your area, that are looking into answers to some of the arimidex and Herceptin questions, and whether you may be eligible to participate if you so choose.