I've got the same..or similar problem. I was playing in "immortal" mode, got decapitated. Now my head follows me like a bad joke, dropping out of the sky and rolling around my feet at most inconvenient moments
I guess I *should* have immediately gone back to the previous save, and restarted that combat, but I was too silly to do that. That was a few days ago, and I've accumulated so much more stuff, that I don't want to loose it all now by trying to find the last pre-decapitation save. I'm thinking, there must be a file *somewhere* that gives your player description ? Would it be at all possible to search back to a save just after when you commenced the game..check out the file to see what your description was then, and copy the info regarding what your head was, and replace the info in current save with the old head info ?? Maybe I'm being totally stupid with this idea..maybe someone who knows their way around the Skyrim file structures could tell me if I'm barking up the wrong tree ??