Here is a headline from a BBC site article: "UK economy: Why aren't I feeling better?"

Aren't I? There is no way that is correct. It is just plain bad English. "Ain't I" is not formal English, but at least it is a contraction of "am not," which is gramatically correct in this sentence, if not formal. "Why are I not feeling better." Come on, folks. Go ahead and use "aint," just use it correctly.