U need to grieve, this is taking time out of your daily activities as well as being on your mind! What's the operation - I had lumpectomy under GA, the biopsy showed changes in the tissues hence the precautionary radiation treatment.
My surgeon did tell me : "Your type of cancer does not require mastectomy, if U continue to be worried in future we can reconsider". After 12 months he asked whether I had thought about it. He was so positive that it wasn't necessary in 'my type' that I hadn't given it any more thought. It may be something to discuss if U feel it appropriate for you.
Have U been given the nurses number for 24/7 contact with worries? I was tired during the treatment every day at noon to co-incide with going into the Office to work, but that was more due to the very hot summer. I would drive home, go up to bed with 2 cats and the dog cuddled up. If I was late the Siamese would stand half way up the stairs as if to tell me it was time for bed

Any idea when U are likely to get the surgery? I then had to wait for a month to allow the area to heal B4 radiation treatment . Get plenty of food into the freezer as well as nighties that do up down the front; not over the head as you may be stiff and sore, also it's quicker when Doctors do their Rounds ;-).