I've had this thing over a year now (pain in my side, still unexplained), most of the time I'm fine, or down at 2 or 3, but it seems to act up sometimes escalating to about a 5 for up to a week at a time, spiking to a 6 or 7 but on friday this week, I was certainly unable to move or speak for several hours, I'm just glad I managed to keep silent and blink back most of the tears. (I was pretty much curled up in a ball at my bosses house, I didn't want to worry his kids)
My point is, though, I stop being able to physically move before I stop being able to talk or think, when the pain started subsiding a bit I was able to respond to questions (with difficulty) from my bosses very overly curious kids long before I could physically move. I would put "Unable to move" as an 8 and bump the others up.
I remember the worst pain I ever felt (5 or 6 years ago, different issue) I threw up from the pain alone and the morphine they gave me was like a sorry joke, but I was just barely able to answer questions.