IMessage isn't linked to my phone number anymore...how can I get it back??

I don't know what happened...I've been iMessaging on my phone all day, but about an hour ago it stopped sending iMessages from my phone and started sending them through my email address. When I go under Settings>Messages>Send&Receive, my number shows up gray and there is no check mark next to it. But my email address is in dark blue and selected.. Any suggestions on how to get it back to send from my phone number?!
Thank you!!
Athina K.

Hi ...
Sign into iTunes using  your Apple ID then re sync content.
From your iTunes menu bar click Store > Sign In

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