Should I Go On Vocal Rest?

I've been singing non stop for about 3 days. I've really been pushing
my voice more than usual. I have a show Thursday night. It's just a
few songs but it's my first show and I really wanna do good. My voice
is completely shot. It's hurts my throat to sing. When I talk my voice
sounds really....grumbly. And my voice cracks when I sing and I can't
go as high as I usually can.

Should I go on vocal rest...or should I keep singing to get my voice
use to it? Any other tips?