Possible broken or sprained big toe...what should I do?

While I was walking down the stairs, my big toe somehow my big toe got under my foot (if that makes any sense) and once I stepped down to the next step, I stepped on my big toe and I hear a loud pop sound. My big toe is swollen, tender to the touch, and I can barely move it. It's very painful and I can't bear a lot of weight on it. My foot is also cold and the sole of my foot is also tender to the touch. The pain goes up my leg when I sit down also. I'm not sure if it's broken sprained but I won't be able to see a doctor until early tomorrow morning because my twins are sleep and I have no babysitter and my husband is at work until the a.m. What should I do?