Site down and now database errors, help plz..

[Sycoloco1212]

im getting the error in my email.

Database error in vBulletin :
 
Invalid SQL:
 
			SELECT *
			FROM datastore
			WHERE title IN ('','options','bitfields','attachmentcache','forumcache','usergroupcache','stylecache','languagecache','products','pluginlist','cron','profilefield','loadcache','noticecache');
 
MySQL Error   : MySQL server has gone away
Error Number  : 2006
Request Date  : Thursday, December 18th 2008 @ 05:16:21 AM
Error Date    : Thursday, December 18th 2008 @ 05:24:39 AM
Script        : http://******/forums/misc.php?show=ccbmessages
Referrer      : http://******/forums/
IP Address    : ********
Username      : 
Classname     : vb_database
MySQL Version :

my site isnt coming up now, did i get hacked or somthing? i havent changed anything in my site for a few days and nothing i edited..

--------------- Added [DATE]1229620818[/DATE] at [TIME]1229620818[/TIME] ---------------

also getting this error in my email.

Database error in vBulletin :
 
mysql_connect() [<a href='function.mysql-connect'>function.mysql-connect</a>]: Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (111)
/home/*******/public_html/forums/includes/class_core.php on line 311
 
MySQL Error   : 
Error Number  : 
Request Date  : Thursday, December 18th 2008 @ 01:55:35 AM
Error Date    : Thursday, December 18th 2008 @ 01:55:36 AM
Script        : http://*******/forums/misc.php?show=ccbmessages
Referrer      : http://*******/forums/
IP Address    : *******
Username      : 
Classname     : vb_database
MySQL Version :