scared - chemo again - navelbine

Hi - I have bone mets. I just came from the doctor. My fears were confirmed. My CA2729 tumor marker is again on the rise, 55, and recent PET scan shows more tumor activity, so the faslodex I was on isn't working. Was on taxotere & herceptin for 6 months last year followed by faslodex. I started navelbine along with herceptin today. I'll have it weekly. I hope I can stay strong, that the side effects won't be as bad as the last chemo, and that it will kill these damn cancer cells. Those of you who've dealt with navelbine, please let me know your experience: side effects? how long have you been on it? is it working? Thank you. Pam