I am a breast cancer survivor and was diagnosed 2 years back when I was 31 years old. I underwent lumpectomy followed by chemo and radiation and am on hormonal medication now. My daughter was 4 years old then. I know how you must be feeling. I was also very scared of how will I be able to look after my daughter during treatment but frankly it was not as tough as I had imagined. Time passes by and you get over it. And children are very smart these days. They understand a lot more than what we give them credit for. Don’t worry so much and stay positive. It may not even be cancer.