If I were you, I'd be open (but not TMI) about your upcoming surgery at work. Do your work friends/circle know about your diagnosis? If they do, often times, people will approach you and ask how they can help. When this happens, BE SPECIFIC. I think a lot of times, people say that, but don't really mean it and we don't answer them, so soon the moment is gone. But you need help! IF you are specific with them (ie, "You know, I really could use a ride to the hospital the morning of the surgery...I'd love a casserole that I could reheat...etc.), then I'd think their response would be positive. I think your specific request for help would seem so small that they'd be willing to help you out.
It's good you are thinking about this ahead of time, but I would act promptly. You WILL be somewhat dependent on someone after the surgery for a while. Maybe the hospital or oncology social worker would have some suggestions. I had my bilat in August and I was GLAD to have support of family and friends because it took a while until I felt like myself again. I think you'll be happier if you can arrange for someone to stick around w/you at least a few days after your surgery. Good luck, I'll be thinking of you.