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.
Hey I am proud of you. That is a wonderful attitude and we know you will hit some bumps, but we are your safety net so just keep on putting one foot in front of the other. You got it right!
Special hugs and prayers.