Updated to iOS 7, can't download anything?

So yesterday I updated my iPhone to iOS 7, but I had to delete all my music off my phone so there would be space to do it (its all still on my iTunes on my computer). Today, I plugged in my phone to re-download my music to my phone, but it's saying I don't have enough room because there's a huge thing on my phone called "documents and data" that was never there before and is taking up all of my space making my phone useless. What am I supposed to do to get rid of it? I've deleted everything and it isn't helping.

Added (1). I backed it up and nothing is left on my phone except my contact list and when I tried to find information on the Apple Customer Service page, it said my "coverage plan" (whatever that is) doesn't support me calling, and I would have to pay 70 dollars.

Make backup in iTunes then completly delete iphone and get new ios install. Don't do auto restore of backup! Try to add one thing afer one from backup back to iphone.

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