Definitely enlist your GP. It's an absolute pain being diagnosed at the end if the year. I felt utterly abandoned when every medico disappeared. I never had a chemo education session as they didn't run them over Christmas/New Year period. It was very difficult indeed.
If you have to be a squeaky wheel, so be it. I agree with @Zoffiel, it's highly unlikely your oncologist's office will be shut until February. They tend to work in groups; someone will be able to assist you.
If all else fails, give the BCNA helpline when they re-open next Monday. They may be able to assist. 1800 500 258.
I'm so sorry this is happening to you Cathy. K xox