How can I ease the pain in my foot?

It's not the pain you feel when you get a charlie horse or cramp. The pain is coming from the top of my foot but it feels internal as well. I looked and I don't think there's anything really notably different on the outside, but it hurts so badly. It feels as if the inside of my foot is being grinded... Just, is there a way to ease the pain? I know it's hard for you to get a good idea of what the problem is but I know absolutely nothing; maybe you know more, I don't know. Thank you.