Just come outright and tell everyone. You can even put it as a fb status if you wanted. Just something simple and straightforward like "Please no visitors until thursday or friday" (or never if that is what you want ). If you feel you need to justify it or anything, you could say your doctor told you that you are not allowed visitpr until then. I thought you were very brave letting everyone know when you were going in! Alot of people I know won't tell anyone when they are booked in, because they don't want to have to deal with this same issue.