login issues and more…

I am not sure what happened to my website. First I noticed that my sliders weren’t sliding like they use to… I couldn’t figure out how to fix it so I left it for now. One month later and now my website is missing– I use to be able to login in as a www…. now I have to find the site by http What happened? I can’t even login into the wp-admin without getting this… the Warning: Cannot modify header information – headers already sent by (output started at /home2/venus/public_html/wp-includes/bookmark.php:443) in /home2/venus/public_html/wp-includes/pluggable.php on line 1178 http://ocbestchoice.com/wp-admin

Anyone know what is happening??? I called hostgater, and they said everything is fine on their end.

Perplexed in the OC!