You have every right to be tired. The breast cancer alone is enough to set off anyone's anxiety and now a possible lay off.
My best advice is try to stay in the moment, not easy I know. Don't worry about the lay off as it may not happen and when it does you will deal with it at that time.
For now take care of you and be in the best possible frame of mind going into surgery. You might talk with your physician about an Rx to help you get through the anxiety pre-op unless you are already on a med.
Blessings to you and prayers for a good outcome.
Moderator Anxiety ~ Panic Disorders
*~* Not a mental health professional at all *~*
Dx: Anxiety/Panic, Depression
"If you doubt you can accomplish something, then you can’t accomplish it. You have to have confidence in your ability, and then be tough enough to follow through.”