How can I stop knee pain?

I fell back in February on ice and injured my left knee. I am waiting on workers comp to accept the claim. I am unable to bear weight on left knee. When I place weight I have huge pain when my knee is bent. The pain is right in front of my kneecap. If I pivot my knee inwards it will lock on me. I am in extreme pain non stop and was wondering what is wrong or how I can take the pain away up until the workers comp allows me to get an mri of the knee. Any suggestions?