Scraped the left side of knee sliding in softball (but i was safe =)?

I very stupidly stole second and slid without a sliding pad on (i was safe but my team left me on third=(- there is no blood- there are many little scrapes that stung like hell when it first happened- and then were ok. However, when I got home i tried to clean all the sand off of it and it hurt so badly I cried. It is red and puffy and is stinging and tingling and feels very hot. I don't know what to do or what this means, but I cannot sleep right now. Also, whenever I bend or unbend my leg the pain intensifies. Any insight would be greatly appreciated=)