IPhone 4 messages gone, and I can't send new ones

Just a few minutes ago, I switched to my messages (and I had gone through them only a minute previously) and all of my stored messages are gone. I can still see their contents in the search bar, but whenever I try to access it through there, my messages app crashes and I still get nothing.
The only link or cause I can think of this (and it is a bit of a long shot) is that someone may have tried to FaceTime me around the time the messages vanished. I only suggest that because of the post on the forums about FaceTime after April.
I also tried to send a text message after they all vanished and I'm unable to - the "Send" button remains grey and tapping it does nothing.
Does anyone know how to fix that, and restore all the missing messages if possible (my backups aren't quite recent enough to get a full recovery).
Would post my iOS version, but the "checking for update" screen is stuck loading.

Also worth noting that while I can't give the exact version of iOS, it's after iOS 7, and ym device is not and never has been jailbroken.

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