long term herceptin for bc mets....

Hello, This is my first time on this site. I was diagnosed in February this year, so have had right breast masectomy, in April started chemo for 18 weeks and herceptin and then radiation. I am now on three week herceptin. Had most of my right lymph nodes out and it has spread into my lungs. I am feeling pretty great but have now lost all my iron so am feeling pretty washed out, my oncologist today has put me down for a colonoscopy to see if that is where I am loosing blood that is affecting the iron levels in my blood. I told him it was probably all the blood tests I have been having, but he didn't see the humor in that. Love to hear that there are so many of you that have had long term success with herceptin treatment.