Dear Majo,
So sorry to hear of your diagnosis - but you are in the right place :) I'm not sure about the pagets diagnosis and what it means but I think its really important that you take your time making your decision. I know that the mastectomy idea seems like it will more quickly solve your problem but it is a big thing and something you want to be sure of your decision about. Before I had a mastectomy (no reconstruction) 4 years ago (aged 40) my surgeon insisted that I get a second opinion. As she said her opinion was that I needed one but she wanted me to be sure of her advice because she didn't want me to have it, and then wonder if I really needed it. I have found I have developed back issues 4 years after mastectomy from being lopsided (even wearing the prosthesis). Also dressing can be quite difficult. That said if it needs doing it needs doing but just maybe check all your options out thoroughly so that you feel confident that you've have made the best decision you can under the circumstances. Best wishes to you.