What's the diff. between "I feel sick" and "I feel sickly"?

Asked by gailcalled (54644) March 23rd, 2007

Elizabeth Edwards announced yesterday, sadly, that her breast cancer has returned. She said, "I don't look sickly. I don't feel sickly." Would "I don't feel sick, etc" mean something different? Laura Bush said recently, "I don't feel badly, " meaning the same thing. A flutherer (whose name I have forgotten, so can't give attribution)" suggested using "ill" in order to be clear.