My iPhone 4s just deleted all my contacts? D

I literally just opened my text messages and there was nothing but numbers and then i looked at my contacts and they were all deleted.luckily they're all still on iCloud but they won't sync to my phone and then when i tried to manually type all the contacts back in, none of them are saving into the contact section
does anyone know how i can fix this and i really really don't want to restore my phone because i have so much stuff on it that i don't wanna lose D: help!

Did you try turning the phone off and letting it sit for about 5 mins so the memory can clear? If this does not work a hard reset may be your only answer

Write down all the numbers, so you don't lose them--and note whose number is whose.
Then call your cell phone carrier's customer service line, (from your home phone), and
see if they can fix the problem for you. If they can't, then take it into your nearest dealer.

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