I can't send imessages from my iphone after I updated it to IOS7

I updated my phone and now it won't send my imessages. The load bar almost goes all the way to the end then stops and never completes the send. I turned off iMessages in settings so I could actually use my text messages but then I just looked at my ipad (which is working with the ios7.01) and realized I am not getting texts to my iphone now!!! This is so frustrating! I don't know what to do!