+1 on the doctor.

When I sprained my wrists a year and a half ago, I learned plenty about everything that can go wrong with all those little bones and tiny passages for the blood vessels and nerves. It was pretty scary, and the scariest part is that often the only symptom is pain until stuff starts to necrotize.

Thankfully I didn't have any of those complications, but you should get it checked out. Hope it's "just" sprained and that you heal up quick.