Micca, I'm sorry you've blown out you knee. I've ruined both of mine, but some things help. I agree with the just above advice of elevation and ice and analgesics. I like naproxen, if you can get your doc to prescribe it. But I highly recommend Glucosamine to help rebuild the cartilege. It really makes a difference for me.
Hope you're on your feet soon. All the best, Chance.