I am so sorry you have joined our club. However, this is a wonderful group and we will be right there beside you every step of the way. I had a large tumor (6cm) with other smaller ones throughout the breast. I ended up needing a mastectomy(I had a lumpectomy first). It had also metasticized to the lymph nodes (thank goodness only 1). Since my treatment of chemo and rads, I am definitely a survivor. You will be, too. I agree that information is power and you need to be your own advocate with your medical team. Please don't be afraid to ask any question here. Chances are someone has been through the same thing and can give you some advice.
Take it one step at a time and things will be easier to handle.