How can I heal a hoarse throat?

I went to the doctors the other day and they told me I have a head cold so he gave me a shot and some medication. I was expecting to get better and everything did except my throat.

Yesterday it started cracking, and then it got worse and worse until by nighttime i voice sounded like a man/toad. When I woke up in the morning I sounded squeaky and airy. You could barely hear me.

I'm not talking because I know that helps but what else??

Thanks!