Earlier today I reached down to my leg to scratch, bending my wrist forward (palm toward
wrist) to do so. Suddenly, however, a sharp pain shot through my
wrist and I have been
in pain ever since. I must keep it still to avoid the pain, and it hurts worst (excruciating and sharp) when I bend my wrist up, or towards the top of my arm (the opposite direction to when the injury occurred). Sensation/pulse in the fingers is fine, other wrist is perfect.
What could it be and what should I do?