I think it is probably the mammogram that has made your breast sore as that sometimes happens to me also. I know it is very concerning and worrying to be sent to the surgeon but it doesn't mean the worst. He will explain what they have found in laymans terms so you understand, and ask him as many questions as you can. It is a good idea to write down some questions before you go because when you get in there, if you are anything like me you will forget everything that was in your head.
Try not to worry too much, my thoughts and prayers are with you. After the surgeon's visit make sure you post to let us know how you got on. I'll be thinking of you.