Hi Cate
This is Kathy from BCNA's Policy Team. What a worrying time for you. I think these scans and tests are pretty routine after a period of treatment and are done to see what has happened to your cancer over the course of that treatment. Has it shrunk (hopefully), has it stayed the same or is it growing. They will use this information to help decide what to do about your treatment - continue with it, change to something else, or perhaps you can have a break if it is all looking good.
It is a long time for you to have to wait and worry until 27 January. Could you ring your medical oncology clinic or breast care nurse (if you have one) to see if they can get you in any earlier? Tell them you are anxious about the results and having trouble sleeping.
Enjoy your running in the meantime!
Best wishes, Kathy