Ket, I don't think the grade of the cancer predicts where it might go.  Breast cancer most typically metastasizes to the liver, lungs, bones, or brain; but I've heard of people with metastasis to unusual places too.  If you are having some spatial awareness problems that aren't typical for you, call your medical people and let them know.  If your tumor was Estrogen Receptor Positive, then a drug like Tamoxifen would be a good follow-up drug.  I'm guessing that you've already been tested for your ER status and that the doctor determined that Tamoxifen and its relatives wouldn't help you.  New drugs and new approaches to follow-up care are regularly being developed, so you probably want to schedule routine visits with your oncologist to ask questions and be checked out if you are not already doing that.