A hospital pdoc told me once when I was being discharged while still not well but not expected to be well for a few weeks because of what I was going through that there is nothing wrong with going back and that I'd be surprised how many people do go back within a few days of going home. Don't forget that is an option and they would rather help you when things aren't that bad than have you get really sick. (I didn't go back in and should have, for the record).