Recently been diagnosed with Ductal Carcinoma in Situ, Breast Cancer.

Im absolutely terrified as I have my lumpectomy operation next Tuesday ,21st May. Will my breast be a different shape? What will the pain be like?, will I be able to get up and walk about? I’m so worried about the operation, I feel sick with nerves. 
Like everyone else, I was so shocked when I got the news. I’m also very concerned about the Radiation therapy/ chemo after.