OUCH!!! What should i do?

I was building some flat pack furniture today and was stupidly using an OLD screwdriver with a lot of rust on it! I was screwing a nail in when the screwdriver slipped and stuck into the skin between my thumb and the finger next to it, I've just put a plaster over it although it went in pretty deep, it still hurts and it bled for ages, and now has a huge disgusting hole, but because the screw driver was really rusty, will I need a tet needle? Or shall I just leave it to see how it goes?