Dear Kathy,
I don't know why your onc scared you so about side effects of Herceptin. It is one of the best drugs around for treating bc. I've been on it for 15 months with no problems. Just had an Echo and am waiting on results of that. One time when I was in treatment I began to cough, the nurses came running, they had it dripping too fast and that's the reaction, slowed things down and I was fine. Yes there are some side effects, the day after treatment I'm usually wiped out, sometimes two, and I have some back pain but that is another issue with my Stage IV bc. I have no neuropathy and am fortunate in that regard.
Keep in touch and let me know of your progress.
ginkott1@aol.com