Went to Spawn on a Server, and now Minecraft is Not Responding?

So I went to a spawn on a server because, actually I don't know. Looking at the ranks of Staff and all. I knew it lags terribly, and usually I can at least type "/p home" to get back, but now, nope. Can't even move. If I press Esc the screen gets white. I can still see the game some, as this has probably happened to you, you know what I'm talking about. I don't know how I'm going to play on this server again, and it being my favorite server, this is going to be more than just a small loss. And I don't want anybody saying "Get over it sissy baby, find another server. Solve your own problems. It's just a game." Because I seriously need help. I mean, you don't know how much I like the people on this server. I know pretty much everybody, since it's a small one. And by small, I'm usually on there by myself. But please help. I'll give you cake!