I felt the same way for a short time, and it still creeps in once-in-a-while. I have the added burden of being very overweight and was told they can't treat me with radiation because of my size. I'm also not a surgical candidate because of this. My only chance of survival is hormone therapy and losing enough weight. I'm trying very hard, but did I mention that one of the hormones, Megace, is a powerful appetite stimulant?
I guess I'm just trying to give you the "it could be worse" lecture, and that you likely have more to live for than you're allowing yourself to believe right now.
With regard to needing some temporary help after surgery, ask your oncologist if they have a social worker on staff, or through the hospital where you have the surgert. Your insurance might cover home health care in the form of a nurse several times a week for several weeks coming to your home to make sure you're healing okay. The SW may also know of emergency state funds that might be available if you are low-income. She may have other possibilities.