Diagnosed with DCIS I have implants

I asked about reconstruction at the same time he was keen said I would need expander probably for 3 months. I don’t get that. At least fix it at the same time. He said the nipple would have to go. Do u know if I don’t have treatment how much time I would have left.  Seems all too hard. I am just recovering from back surgery only 6 weeks ago. Now to have another operation. I know this sounds selfish. But I think I am done.