Oh bummer, @Sharon01 - not the news you want to hear - but you've come to the right place for support and info.
Once you've seen the surgeon, you'll have a good idea of the battle plan. Do you have someone to go with you? It can be quite daunting on your own. A buddy will also be an extra set of ears and support for you. The surgeon should have a Breast Care Nurse with him/her, to help you thru it & co-ordinate your appointments, etc
A few tips for surgery - take a front opening nightie, some magazines or puzzles (novels are no good! Too many interruptions!) Take ear plugs and an eye mask (they are brightly lit, noisy places!) And some 'nibbles' .... Ask the Breast Care nurse about a supportive pillow ..... it is a great aid, post op. Others will jump on with lots of other tips soon, I reckon.
Where abouts (roughly) do you live - city/town .... there may be some members close by who can offer advice specific to your location.
In the mean time - take one day at a time - tell those who you believe 'should know' and will be supportive of you (I didn't tell ALL my family initially.) I kept everyone 'up to date' with a bulk email now & then .... much easier than replying to everyone individually. Some set up blogs online for people to access, or a special Facebook page. Whatever makes it easiest for you.
Take care, I hope you have supportive friends & family around you at this time. Things get hectic at Xmas .... try & keep it simple this year - or within you 'new limits', post op.
Big hugs coming your way xxxxx
(The My Journey Online Tool is available here:) https://www.bcna.org.au/understanding-breast-cancer/resources/my-journey-online-tool/