This is because there is a big blockchain stress test running right now, means that you are not the only one who face the unconfirmed transactions after so many hours. Check this thread for more info https://bitcointalk.org/index.php?topic=1098263.0
And as you can see at blockchain.info there are more than 11k unconfirmed transactions, but as I know it will be confirmed after the stress net ended. I also have two uncorfirmed transactions since more than 5hours ago..