Hi Kat1601
While you are waiting for some replies to your post I've attached a link to our publication on Herceptin:
http://www2.breastcancercare.org.uk/sites/default/files/bcc41_trastuzumab_web_2014.pdf
It might also help to call our Helpline to talk this over. They will be open tomorrow from 10-2 and on weekdays from 9-5. The number is 0808 800 6000
Very best wishes
Janet
BCC Moderator