You wouldn't be able to feel anything though, because the brain (the controling factor for pain) is no longer attached.
Ya from your body sure, but I would assume what is left of your neck is going to be in severe pain.
As well as the fact that your brain is panicking wondering what happened to the heart, lungs, and as to why they seem unresponsive.
So even if your head is detached, you still have nerves up there that will be vomiting pain signals.
I feel like the death penalty is right where it should be, or at least how it should be in Texas.
We don't take to kindly to law breakers round here.