Herceptin Cost

Hello Everyone,
Yesterday I got the results of my bc pathology re-testing, which was a FISH test. Fish positive for Her2. I had a 2cm bc tumor er/pr- Her2 3+ high grade, with no lymph node involvement, had a lumpectomy last September. 6 Taxol treatments completed in February. My onc wants to start me on Herceptin now. She told me the drug could cost up to approximately $80,000 for a year. I would be responsible for 20% of that. My point is, and I'm not sure if it is because I am totally overwelmed after all the treatments or just plain whinny, do I really need Herceptin. Granted, I am Her2+ but I had no lymph involvement, clean margins after surgery (they were close, but clean). It seems to me that it is a large expense to put my family though for something that MAY help for something I may get again.