You do control that other address, the change address, correct?

You can try to spend those coins you sent to that address. Try sending them to another address you own, even tho it's balance is not confirmed.
Use bitcoinfees.21.co to find the appropriate fee for the transaction and then double it, that will confirm both of the transactions.

So to recap, you will be doing what is called Child-Pay-For-Parent (CPFP) which means that you will make another transaction that is dependent of that one and has fees high enough for both of them together. That will give miners the incentive to confirm them both.