Do you have any friend who can possibly stay with you for a few days at least? It's a lot to think about but if possible, try and think about the big priorities:
Your surgery will help you get rid of cancer, that's a good thing!
You are a lot more than your breasts!
Your body is an amazing organism and can do extraordinary things. Trust it and it may surprise you with its resilience and strength.
You are not alone - many women have done this and many women are wishing you well.
Very good news about your scans - don't lose sight of that. Best wishes.