I am so sorry to read your news. Have you tried Halaven? Several people in this group have been doing well on it.
Try to check
www.clinicaltrials.gov and look up her2 positive breast cancer trials in the search box. There might be trials that are available in your area. I think you have to scroll down to near the bottom of each trial to see trial locations, but it is worth a try. There might be something that you and your oncologist are not aware of at the moment.
Take care. Don't give up !!!!!!! Keep putting one foot in front of the other and keep going no matter what.