Upgrade issues ios 7.0.4
I had big problems at the weekend after running the new ios7.0.4 upgrade. My whole phone went black. A friend took my phone and eventually managed to get it back up again for me but now my itunes account cannot find my iphone and my Facebook application has corrupted (or it looks like it). What do I need to do? Thanks
iPhone 4S, iOS 7.0.4