Vbulletin suddenly throwing mysql errors

[محروم.كوم]

I'm running vbulletin 3.83 and recently moved one of my sites to a shared server. It has been working fine there for about 3 weeks. Then suddenly about 30 minutes ago it started sending me emails with lots and lots of mysql errors. The messages I'm receiving are:

Code:
Database error in vBulletin :

mysql_connect() [function.mysql-connect]: Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (13) /home/mydomain/public_html/vbulletindomain.com/forums/includes/class_core.php on line 311

MySQL Error :
Error Number :
Request Date : Tuesday* December 8th 2009 @ 0437 PM
Error Date : Tuesday* December 8th 2009 @ 0437 PM
Script : http://www.vbulletindomain.com/pp-51...o/161/size/big

Referrer :
IP Address : 76.249.67.27
Username :
Classname : vB_Database
MySQL Version :
That "http://www.vbulletindomain.com/pp-514/showphoto.php/photo/161/size/big" is acutally a URL inside of photopost's part of the site.; but the error is coming from vbulletin itself. Does anyone have any idea what's causing this and HOW to work around it since I can't even login as the admin while these errors are happening?

Thanks! __DEFINE_LIKE_SHARE__