How Can A Sprained MCL Be Treated?

I have been diagnosed with mcl sprain on Tuesday after 4 weeks of knee pain I was put on a Medrol pack and given a hinged knee brace. X-rays were done on my right knee. I am an RN and worked the last two nights. My leg pain increased through out the night as I was getting into my truck I heard a loud snap and had white blinding burning pain in my right knee. I was unable to move it and cannot bear weight. I think I completely tore the mcl ligament. When I am walking my pain is a 10 out of 10 and It makes me cry when I am sitting it is a 5 with continuous pounding and burning. Should I waste my time and money and go to the ED or should I just suck it up and wait till Monday? I also have to work Monday night.