damn that sucks, sorry to hear that.
Your neck is going to be hurting for atleast a week. I remember getting rear end really bad (totaled the car). My neck was so sore and stiff the next day, but I went to the doctor and took some medicine which ease the pain away.
Be careful....if you get a kit and you get into a small fender bender with your bumper expect major cracks <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/sigh.gif" border="0" valign="absmiddle" alt='
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Good luck with the outcome